Posting limits
The thousand-post "limit" is mostly to assist with archiving games, if you choose to do so. If you archive a thread that has more than 1000 posts in it, you'll only get the last thousand posts...whatever's at the start of the thread is lost, at that point.
If you have no plans to archive your threads, or if you're treating, say, your OOC thread as 'disposable', you can have as many posts in it as you and your players are capable of producing (I'm in a game where the GM never archived the OOC thread, or worried about going over the limit...there's like...6,000+ posts in that thread, now...)