if start with wp8 and windows store apps then other platforms will have limitation. 🙂

i am sure that you can handle it with unity platform dependent defines.

i make my games for platforms; ios, android, mac os, wp8 and windows store apps. i quit playmaker because it is not compatible with all platforms and it does not give source code. also it has no collider option on any action. so your asset is great for me. if you make it compatible with all platform it will be perfect 🙂