To give us somewhere to detail how proposed features would be implemented (before implementing them) and to serve as a reference to their implementation once they are finished, I've created a feature proposals page on the wiki. Actually, I created this some time ago, but I've moved all the proposals to separate pages to give more room to develop them further.
This is whats there so far:
I also created a page for "contributor quickies", which are just easy development tasks for people who'd like to become familiar with the engine or otherwise contribute. Right now there is basically no content, so I'd appreciate if you programmer folk would begin adding to it. I also created a TODO list that is feeling similarly empty. Your help is greatly needed for these pages to materialize, and I believe that having these pages will ultimately help ourselves and others help us.
Also, I'd appreciate this being stickied for reference.