Same problem here. Makes sense, I've managed a forum before and I get the logic behind it.
Just curious: does the 20 post rule include comments on a thread, or is it only in the creation of new threads? I'd assume it's all of them, otherwise it there'd be way too many threads with no purpose other than to legitimize new accounts.
Let me know, as we're also looking to promote a game of ours, and it is a bit unfortunate we can't post links since we're using a new account here on the forums.