Personally I'd call for a whole reform of the forums. Put a specific area for guests to ask their lazy questions and have it auto clear up at the end of a month. Put a specific tutorials area. Basically make sections out to be more specific. The only thing is I wouldn't want is to strip the board of all it's current posts during the reform
Also to put a front page, faq, or some warnings up on the forum to use search or to look for answers etc.
Of course probably send out a mass ban email warning that if some people don't answer it they will get banned for inactivity. Not like, they've been busy for a month and don't have anything particular they want to post on. But for the users who created accounts to get a few questions answered and just left.
of course that's my two cents for what should be done besides banning, warnings, etc. Not saying I should be the one to do it. But I'd certainly would put my effort into it if I was given the opportunity. I'm online just about every day and check onto the board frequently. So I'd be able to take care of most situations fast.