(I'm browsing not-so-old-topics and just decided to reply. Probably user noobster won't see it, but please don't bite - it may be useful for others.)
There's a severe problem with the fact that this layout switches between colemak and qwerty when ctrl+shift is pressed: you can't undo close tabs in internet browsers. Most browsers allow you to undo close tabs with the ctrl + shift + t hotkey.
Is there any solution to this problem? It's a deal-breaker :-(
It's a default Windows' setting. In windows you can have multiple 'languages' each with its own layouts set.
To change it: Right mouse click on language bar -> Properties or go to Control Center -> Regional and Language Settings (or whatever they are called in English or your language) -> Keyboards and Languages.
Then go to Advanced Key Settings (or again whatever it's called, last tab). Switching "Between languages" by default has LAlt+Shift - switching layouts in one language is hidden in that option, so change it.
Only options you can choose (for both changing language and changing layouts) are: non-defined, ctrl+shift, Lalt+shift, ` - not much space for customization, probably disabling switching languages and assigning LAlt+shift to switching layouts would be the best for you. (Or, as DreymaR said, disable them and set shortcuts to switch the layouts directly.)
Though, ctrl+shift shouldn't change your layout unless you release those keys together without any other key:
- If you ctrl+shift+T, it shouldn't change layouts. Even when you you release T first and ctrl&shift after that - it doesn't change your layout.
- Unless you try to hit all 3 keys at once and push T first - then reopening doesn't work and your layouts switch.
I've just tested this. I've always used ctrl+shift+T and I always had at least 2 layouts - almost never had problems.
And some advice:
If you want to see what layout is currently set, turn on your language bar. In options mentioned earlier - first tab ('General') should show you your choice of default layout as well as a list of all chosen layouts. Click on a layout, then Properties - and you can change its icon there. That way when you switch keyboards, you see different icon for different keyboards. :)
(For example I have gray, red, and blue (Polish qwerty, Polish qwertz, and Russian) in PL; gray and yellow (qwerty&Dvorak) in EN.)