If you start moving characters around, you might as well come up with a totally unique and individual solution. You're going to have to make your own keymaps anyway. :)

If you stick with the default, you save some time and effort. On the other hand, you end up with a keyboard layout optimized for someone else.

I wonder how bad the default colemak is for writing swedish (or norwegian). I don't know how all norwegian letters are arranged by default, but the swedish chars å and ä are pretty well placed at AltGr+w and AltGr+q. They are swapped compared to swedish dvorak, but I can live with that. Ö is worse placed, AltGr+; where both AltGr and ; is on the right hand.

What do you think? Is having a standard keyboard layout (well, it might be a standard one day) worth having a few of the more uncommon letters on AltGr-combos?

The default Colemak with its international key mappings can be used for writing the Scandinavian languages... in a pinch.

But if you're planning to write one of these languages on a daily basis, you really want to put the special characters in there. As you can see from Padde's post they get some use - particularly the "ø". It'd be far easier for us Scandinavians to put the CWZXQ letters on AltGr keys (except then we'd run into trouble when writing English) if we ran out of keyboard space.

Creating national variants of layouts isn't really a problem I think. The tools for it are handy on most operating systems, and in many cases the way to go about it will be fairly intuitive. For the Norwegian Colemak you can keep the key assignments that the Norwegian QWERTY keyboard uses except for one which only needs to move by one key space. Simple and nice.