I know they've been made elsewhere but some positive suggestions could be made too.
Newbies, shouldn't post at all for at least a few days (I went about a month before I did).
Newbies, shouldn't post more than 2 topics to start with. If those spawn more then they can follow those too.
No one should open new topics if they aren't able to keep up with research etc. on topics they started in the first place.