SF is the hardest to train because if you make him well rounded he needs a lot of different skills. But saying that you can single position train him you just have to play him in different positions not SF. If your training his outside skills like OD, passing, and handling play him one game at PG for the 48 mins if you want to train him in inside skills play him at Center or PF if you can. It is a pain but you can do it.
Rusty