I'm actually working on a secret hack (oops it's not secret anymore), and has been since TF2.0 was released (not continuously though). It's basically just a short ROM in which I try to experiment and apply the tricks that were already posted by others here. I can't seem to find or invent new, nifty tricks. Just, dialogue, battle, dialogue, stuff, battle...
Actually, the biggest difficulty for me is still thinking of some interesting plot to drive the action (that's why I'm not posting anything about the hack until I have something relatively solid and concrete).