1. Very easily (editing templates only needs a bit of HTML knowledge)
2. I don't believe has anything built in to exclusive allow IPs (it can explicitly deny IPs), but there are ways with Apache to do this. You can also set guest permissions to deny them viewing the board but then your own customers won't be able to register.
3. UBB is written in a different language, costs more, is more server-intensive, and has no major feature advantages over vBulletin. Rumor has it that they're a bit uptight about bugs but that's just what I've heard and I'm sure that they'll dispute it.
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