That's what I was thinking, Decent activity (not spam, not GLWS on every post, that dequalifies you) stuff that actually mean something to the thread and help out the thread, good conversations and respect for other members.
Helping members out on the daily, especially new members.. give them tips rather than watch them get spammed with -45 for one silly mistake they made
Finding multi's is a top one too, or reporting threads that are not allowed as soon as.. little things that could help the forum out a lot.