How about a skill/talent for each discipline? Discipline Mastery sound good?
I'm not entirely sure what this is going to do or what problem its solving.
I think the suggestion was meant to be that instead of buying powers individually from each tree you would merely buy a talent which would grant you access to the entire discipline.
No sorry I was trying to suggest that a new talent called (Discipline) Mastery be added that replaces the stat bonus and maybe gives +10 per level to manifest as it would mean you could improve any discipline at the same cost when rushing to get ready for a RT game.
It was something I was working on as part of my attempt to make some house rules and it didn't cross my mind that other people aren't aware of it.