Botting always has some sort of risk, so botting on any important account is a bad idea, As far as bans against questing goes it seems to be very minimal, I've leveled 3 toons to 90 without any problems, but if you get stuck or someone gets mad that you're level 41 in a 35 zone because you didn't relog then you might receive bad feedback and your chances of being banned is increased.
