Funny that you consider that a flaw. I'm not sure if it's a snooker player thing, but I feel my most comfortable when gripping the butt of the cue. Probably why I generally don't bother with using an extension when most probably would.
As long as it doesn't alter the position of my wrist. I wouldn't think twice about holding the back end.
gripping the butt is probably as old as tall pool players. hardly a flaw