<plug> Use the proper Colemak, and the support level will be much higher! </plug>

The xkb dir have moved as you say. In most distros nowadays you'll find it under /usr/share/X11/xkb. There's some more info in this topic about the Wide mod if you're interested.

Last question first: Enter in the middle isn't a bad idea per se, but:
- it's not possible to physically move your keys like that
- with the Wide mod the physical Enter key is closer than before and thus easier to hit
- I shudder at the idea of putting something else on the physical Enter; it's just ugly!
- my Extend layer (not yet implemented in Linux but will be) lets me hit Space+Caps which is surprisingly good for a second way to hit Enter!

I don't remember what the difference between Colemak and Culemak is. Care to link to it? Myself, I try not to make changes to the Colemak main block (anymore) but modular additions to the other layout aspects! I think that splitting up this small community into a bunch of "C*lem*k" fractions is a very bad idea but maybe others think I'm doing just that with all my talk about 3rd layer enhancements and Wide mods; who knows. It's not an easy subject. Also, I feel that for instance the Wide (or, more accurately, the Left Hand Angle) ergo mod is a better solution to issues that have prompted some of these fractions like the awkwardly placed 'b' key.

You could tweak my patch file manually, I believe. Then you'd have a fix for the latest Ubuntu at least - and you'd be able to select both the layout AND the wide keyboard (pc105wide) separately from the Gnome panels. To call it something else than 'colemak-ED' you should just search-and-replace in the patch file but make sure you don't use an existing layout name (a category in which 'culemak' fortunately for you doesn't apply). Then tweak the part of the patch that contains the four-level layout definitions (search for 'symbols' in the file). It should be fairly obvious to do. See, if you were using a "proper" Colemak I might do it for you but since you have a wrong vowel in there...  ;D

Ah, that one! Thanks for reminding me. If it were me, I'd call that Colemak and add that it's been modded ergonomically - that's what I do. It's got a LeftAngle mod for ANSI keyboards, that's all. Otherwise, why not just call it Colemak since that's what it is? :) Especially since you can actually type all letters except the rarely used Z with the usual fingering (by keeping the left wrist straight instead of curved inwards which is a great improvement!). Also, Shai has agreed that using a wrist angle mod on 105-key keyboards is a good idea and this is just an optional way of achieving the same on a 104-key board at the expense of the placement of a rarely used letter (well, apart from the somewhat unfortunate effect on the Ctrl-Z shortcut that is).

Yeah, it's a pet peeve of mine that key placement improvements should be kept separate from letter layout improvements etc etc. You noticed, right? ;)

In this case, I'd recommend changing the ergo mod file instead of the layout file for a more robust result that could be used with QWERTY or what-have-you as well!

If you want to, I can help make such a file including BOTH the Wide and the "Culemak" keyboard model mods. I'll have to warn you that we'd need a better name for it then because it'd be dependent not on Colemak but only on the pc104 keyboard model! Since I've called the other one the "pc105wide" mod ("Generic 105-key (Intl) PC - WideErgo mod"), why not call this other one the "pc104angle" ("Generic 104-key PC - LeftWristAngle mod")?