I like a lot of the ones that have already been posted. I'm just going to pick the ones that I personally like:
1. Eliminate zone defense.
2. Bring back hand checking.
3. Eliminate 3 in the key because they never call that shit consistently anyway, and I'm tired of BS calls against my team.
4. Clear path should be an automatic 2 points and the ball back.
5. I like the replay idea with two flags for the coaches and a ref reviewing the calls. The NFL got it right.
6. Eliminate timeouts and only have play stoppages similar to how soccer does it. Actually, it would be badass if the clock never stopped at all. Run that shit out.
7. Punish floppers with one game suspensions.
8. No star treatment at all.
9. Eliminate the jump ball and have a dunk off instead. Each team gets two dunks. The team with the best dunks gets possession of the ball. (This might suck, or it might be awesome.)
10. Unban all the cool things that fans used to bring into the stands to distract players at the free throw line. They never should have banned those spinning hypnosis signs. Obviously lasers and things that can harm the players will not be allowed.
11. Public punishment of refs who overstep their bounds. Fuck the egomaniacs.
That's all I can think of now.