Working on many things...

I need a hand. So far I've tried Proboards and Invisionfree, and neither is quite right, unfortunately.

Basically, I want to create a messageboard forum where I can backdate the posts, like you can with LJ posts.

It has to be free, idiot-proof, free, customisable, free, and like I say, allow backdating.

Also, I can't use an LJ community, because that would require me creating far, far too many new LJ accounts (it'll all make sense if I get this thing done, I promise), and I don't know that you can edit the date/time stamp on comments, and I need threads, not just posts.

Any ideas?