What happens if a magic user wins initiative due to being allowed to use Reasoning as his initiative stat, but then decides to do something other than cast a spell, like take a physical action? Shouldn't a character with much higher quickness be quicker at taking a physical action?
He keeps his initiative roll, but switching RE with QU and with a penalty of 40 for switching action.
That's the reason I'm hesitant to allow different stats to be used for initiative in my games.
The roll being kept, it's still way easier than most RM2 mechanics, with several rolls, table reading and all, so it's hardly a problem.
Like Majyk, my players realize that you can't neglect quickness if you want to get the drop on someone in combat.
I think most of my NPCs rate QU quite low, as its benefits is foremost for DB, something you can "easily" compensate with items, especially in high levels. Between high AG/ST or QU, meaning between not getting hit or hitting harder, they'd rather choose the former, as evading your enemy's strikes doesn't make them stop. Killing him faster OTOH...