I use the unofficial patch, think I have dresdens first version still, hasn't really bothered updating after that as for me things seems to work as they should. I do also use Bugmod and Blue marble. There's no conflicts that I've noticed and no slowdown in gameplay either, atleast nothing that's noticeable to me.
As I never play MP I have never bothered about that kind of compability issues but if you still like that option, install the unofficial patch as a mod and you'll still have both options. Actually, if I ever reinstall all of BtS I may do this just to be able to easier test other mods that comes along, like I'm yet to try the better AI mod, now I don't know, it may work anyway, I guess it should but you never know.