There is a formal way to apply: send a suggestion (preferably well thought-out) to any daijin, and they will bring it up to the other elected officials. If it's a good idea, it will probalby see the light of day in the Challenges and Activities section within a few weeks/months. Or, if you feel like being somewhat rebellious, you could follow in the footsteps of Scuba Steve, Faktablad, and Pawidge and just post a thread in the General Discussion forum.