Wouldn't it be a good idea to upgrade the demo so it is 2.06 compatible ? Shrapnel just announced a second print run, so ...
Mod compatibility can soon be a real problem, already I'm wondering what unit id to use in my mod so it doesn't conflict with others ..
Dom2 approach to modding (I would call it "delta modding", just adding/changing parts of the vanilla game, as opposed to "standard modding" that overwrites the game files) is so easy to use that I don't doubt there'll soon be a large set of mods !
At least we should know how the engine integrates the mod files (from Last-enabled to first ?), but best would be a sort of "mod testing" proggy that would report conflicts (ie duplicated unit id, nations modded more than once etc..).