Um. I dunno why it wasn't allowed. I'd guess it was just a vB default that was never changed because no one complained before. xD I enabled them now, so it should be working!

The Control+Z thing bugs me so much too!!! I have no idea how to fix that though. I'll try googling it later (or if someone else finds how to fix it that's cool too). xD But I have to dash off right now!