1) Nope... You can either donate $ (click on the credit card icon on the first page) or buy a photohosting account (you can have more pics in your gallery).
2) They moderate
lol, they make sure everything goes smoothly, warn members violating the TOS, remove bad threads etc.
3) No, there isn't. There aren't really enough uromastyx keepers to dedicate an entire forum to it. If there started to be a LOT of uro talk in the general lizard forum, a uro forum could be made then.
4) Well, either way would probably be okay. I'd go with the monitor forum if your question is more specific, and in the lizard forum if your question is more general.
OK?
Zoe