I'm looking into the .sig limiting options now. I think that's a good idea. The number of images is already limited (to 10 though, I may have to lower that even further -- suggestions?), but I think there should be a character limit as well. There will definitely be some existing hack out there somewhere that lets me do that.
That's one of the great things about vBulletin. There is a massive development community that actively look to further advance and customize the software through hacks and mods. It's something JelSoft (the parent company, and someone I used to have direct business ties to) encourages, and to their credit, they're very active in advancing the software as well. As I've mentioned elsewhere, v3 is coming (it's in beta), and that has some really exciting new features.
As far as referrals, check the FAQ button at the top (which btw, with time, will also be where I reside that behemoth of at FAQ project that I was working on at BN), it explains it all, and even gives you a link that you can use to give people.
I haven't yet decided what to do with referral tracking, but decided to enable it to leave open the possibility for future fun reward dealies for high ref folks.
-edit-
Someone started a thread besides me!
