Well, actually, that idea what what spurred on some of the switch to SMF. You see, we can access SMF's loggin stuff externally... which means we can link it into Trac, and the Store, and the rest of the site. We can even carry over the permissions system that SMF uses, if we want to. Since it's all in an SQL database, it's pretty simple to get that information, and do whatever we want with it.... so, yeah, the short answer is: we can definitely do that.
--Chris