I just read a forum post when something struck me... Why do players choose their career anyway? Why not let them train whatever they see fit, without thinking about careers, and if they act out like a special career path let the GM grant them that career opportunity and with it the benefits of it. And same way, if they start to act in a way not feasible for the career take it away from them again.
There is a bit of an exception with magic/faith careers, but those bring their own rules and boundaries with them anyway, so perhaps they are only different in terms of startup.
Any thoughts about that?
Lucifer