To get new members to post, what if you blocked them from viewing the art/stories section until they get like five posts? Make it well known so it will force them to post some stuff and be active.
Perhaps we can do what we did on PSF 1.0 where stuff was locked unless you had an account. Unless we're already doing that lol.
Of course you can force them. They squirm, get all nervous. I feel you tend to get the best scared responses when you force people to do something.