Here's my solution to the problem, why not just make every player at least 100% at 2 positions...yes including your Bols and Bogues', and make exceptions for those that you believe can play 3 positions guys like Oscar, Magic, Paul Arizin, MJ (should be).
It opens the game up a bit and it probably takes some heat off of you. I don't know about others, but I don't play players at any position unless they're 100%...the 99s, 98s, 96s, etc are quirky at best, its like, why not just make them 100.
I'm for a more open game, and I believe it can be accomplished by doing something like this, without getting too ridiculous.