Definitely good idea, taking on an apprentice is definitely a good idea.
The distinction thing is good too, sort of like an arcane mark type effect.
Hmm definitely crafting simple things faster is good. How about an ability to tie in with craft magic item feats. They could get a reduction in time, or cost, or xp cost. If they dont have item creation feats this wouldn't apply, but if they did it would be a big bonus.
I don't really know if they do the whole you get a keep thing in 3rd edition, but perhaps they get their own shop at a certain level.