On a mostly unrelated note, unfortunately: That name, 'dvomak'. I know what caused it, but... it grates my ears? Just thought I'd let you know, maybe you'll want to rethink the naming strategy once more? Of course, if you're perfectly happy with it then by all means. Maybe it's just me getting the wrong vibes and associations here. What's in a name, heh.

If you're on a laptop, you could map Fn+F... key's scancode to CapsLock, or one of the extra media keys you don't use. Also you might consider using one of the right modifier keys like RCtrl or the ContextMenu key for a place for Caps – again, if you're not using that key.
If you're running an AutoHotkey script anyways, you could include some fancier key combination to toggle CapsLock, but you could get in the situation where you're at the Windows login screen and your Caps is ON for some reason and you can't use the script's hotkey. Could be a bit annoying. But if you've got high accuracy, I suppose you could do with one Caps, as you said. I usually have bad accuracy if I have to type small pieces of text and my hands aren't wormed up. I need a few seconds of typing to get in shape (sometimes more).

Happy new year! I see what you mean now. I don't know anything about such a key and it seems the links you posted don't have the answers either. What about asking Microsoft directly? They might be able to help. Or if it's not the OS, but something hardware related, you could try your laptop manufacturer. I'd like to hear if you find something interesting on the matter. It got me a bit curious :)

I do not know but a while ago I contacted them regarding a problem but they did not reply to me.

I used to have this problem while using colemaks capslock mapping to backspace through the registry. I had this problem both with using colemak layout and autohotkey mapping. Now do not notice the problem because the I have returned back the caps lock. I only noticed couple of time that when selecting a single icon on the desktop I end up by selecting a bunch, so I hit the ctrl, shift, capslock, but still the problem exists and I had to reboot. Recently, I am not having any problem, and next time I if I have this problem I will keep in mind testing the number keys, and look at the light for caps lock on my laptop. Also I am sure that Autohotkey is buggy because sometimes when I switch between two layouts (different languages) it inverts the logic of uppercase and lower case and I have to stop the script and restart it again to fix the problem.

I think that the most beneficial thing you could do to avoid further damage to your wrist is to replace caps lock with shift as it is accessed much more than backspace and it  really puts your wrist in a very bad position that will cause pain someday,if it is not already, unless you of course float your left hand while typing and do not twirl your wrist.

On dvomak I have switched the tap with the backspace as I said above, and although you could feel some muscles pain around the wrist for the first few days, the placement is turning out to be a beauty just like ? on Dvorak. And I think that backspace in this position has less effect on the wrist than ' on dvorak and more pleasant feeling because you open your hand to reach as compared to reaching  ' which keeps your hand confined. To reach backspace in this position without moving my hand or wrist I had to further widen my left shoulder away from my body which which rotates slightly the hand inward in a clockwise direction. This slight inward rotation, slightly increase the burden on the the ring and middle finger, but in this way the pinky can access the backspace(Tap) in a fast way with the minimum effect on the wrist and with almost no twirling or turning of the wrist. These simple changes have helped me to advance very quickly on dvomak since I started the layout on the 19th of december 2011 around 20 days and although I switched 3 days ago between the keys "p" and b "I" was still able to advance to 78 WPM for 5 minutes on hi-games and 85WPM on my typing tutor for around 5minutes essay, and the effort was like I am typing around 55WPM and I am loving typing again. I actually would not have dared to increase my speed further if I was feeling pain, but till now nothing :).

A further improvement, which I recommend but I could not get it working in autohotkey is to use sticky keys. I really do not know why one has to hold the shift key anyway. Just press the key to activate upper case and when you type your letter it should automatically be turned off after that, and in case you had to type something like ********************************* you could hold it . Unfortunately, I can not manage to implement key swapping and sticky thing with autohokey and I guess I have to do registry remapping and then try to see if windows sticky works. If I could not find any reasonable solution that works as I wish, if any, I will have to do it my way and build my own pkl.

Dvomak Layout

*  *  *  *  *  *  *  *  *  *  *  *  * Tap.
backsapce        ',ugk         pfcrl
shift                 oieay      dhtns  shift
Ctrl                  ;/j.x       bmwvq  z
capslock

Typing test

The "Angle" ergonomic mod only moves the LEFT side of the bottom row. The right side already has the right stagger for your wrist.

It's been proposed not only by me, but by cevgar and others. See cevgar's topic on the Wide mods.

I use classic on text rows but adaptive on the number row, where I do not use the pinky to access any of the number keys and I type some keys with 2 different fingers depending on the context of what I am typing. On dovmak I do not have . below the middle finger, it is swapped with QWERTY's v key, so the probability of accessing the lower row with middle ring and pinky for normal text (not programming ) is very low. Furthermore, I have already commented on DreymaR technique here https://forum.colemak.com/viewtopic.php?id=1047&p=2

and honestly if you did not minimize access to the lower row the technique will not be enough. I can see this from dvorak, where on the right hand side you have w and if you tried to type key with your hand not floating, you will feel its effect on the wrist, and I have experimented with these key a lot so I am confident of what I am saying. A further good approach that you could use with colemak, and you will notice the difference between your left hand and right hand, is to access p and g with the middle finger. I was typing this way on Colmeak and not programming that much and my left hand was feeling very good until my right hand pinky tip kind of broken and i could not type on the layout anymore so I had to stop typing for a while and then switched to dvorak and started to type the old classical way and programming, but my left hand problem started to appear again, and I was reluctant to make changes to the shift keys, which I was sure that they were the major contributors for my problem, but then I had no option but to change them, and I am happy I did.

On the other hand, I would love to hear how things go out with you when you try the technique after 10 to 15 days and if your results were encouraging, I would probably try it too, but for now I have others things to try, especially trying the swap between backspace and [ on dvomak as it seems that I make errors on the left side more than the right side and it is even closer to the pinky at that position since I hit the space bar with the right thump.

Now, My Question is that can anybody of you see where this modified sticky behaviour could fail and how to improve it:

shift, alt, or ctrl: sticks for one key unless the other pressed key is a modifier
shift shift: capslock and swap keys with symbols
ctrl ctrl : swap keys with symbols only

holding shift, ctrl, alt: will act as a normal shift, ctrl, alt
shift, alt or ctrl + backspace: clear the sticky

activate sticky:
deactivate: only when you press shift 5 times

My own Angle mod (on a ISO board, mind you!) took me two days to learn, and a week to be comfy with. The only hassle after that was switching between modded and unmodded boards which took a little longer to get used to.

The reason it's that simple to learn is that you aren't changing your fingering but just your wrist angle really.