i thought this thread was some kind of joke when i looked at the title
There's no reason why you shouldn't get tutored in another genre. I'm actually pretty sure you will progress faster by going through the jazz, latin and funk stuff, instead of a metal specific teacher. Playing fast is just something that will develop through time and like some have already said, there are enough videos out there on techniques such as tapping etc.
Also personally I think the best bass player in metal are those who have these genres behind them and where it shows in their playing style e.g the guys in Cynic, Between the buried and me, Dream theater etc