Wouldn't it be simpler to just make IS raise the salary for SF position? That way, all those PG/SG players with really high IS+OD+JS would became SF's and their salary would automatically increase.
What will this changes to do the potential cap? We already have 7 skills that are raising the salary for a PG position (JS, JR, OD, HA, DR, PA and RB). If IS and ID start raising the salary as well...than only SB would be free? All 6 outside skills are free to train for C, and 5 are free for PF's (just JS raises the salary). So in theory you could make an MVP center with 150+ skills:
(http://i.imgur.com/iUm4hFL.png)It's already hard to make a 140 skill point PG/SG, from an MVP potential. It usually requires a really low RB. But if IS and ID raise the salary as well, than even 135 could be impossible to train. There needs to be a balance here. I don't want my MVP trainee to hit his cap at the age of 27.