I think when you go in to edit your thred there should be a "resolved check box" I thin you would have more people put resolved in their name

what you could also do is make it in their User CP where the post replies are put a check box that sayes "Make this thred resolved"

but those are just thoughts

That is my oppinion,
-Nathan

PS: This is one of the best Forums sites, I wish more forums sites would use the same look and feel thanks again