So I dont know many other users want something like this but i want to be able to create my own levels for Angry Birds (other games too). i started this twitition below to do just that. Have the Developers release the tools for this to happen. Odds of an Developer support release are low unless this gets major backing, but i think its worth the try and if not we can still discuss what games you would want to create a level too.
twitition - Allow Users to Create Their own levels | Angry Birds
twitition - Allow Users to Create Their own levels | Angry Birds