Great that you can now add two versions in one package. I've used it for the UitzendingGemist plugin and found that it works nice, apart from two things:
1) It crashed when I tested it within MP 0.2.2 stable dir. I'm afraid you have to release two versions too
2) Is it possible to have 'common files'? For example, in my plugin I use some images that are common for every skin, but it seems I have to add them for every skin I import.