Lord, it sounds good in principle, but it seems to be too complicated to be considered by Seth IMHO.

And, unless you only need very few tags to take PSY courses, it would belittle the importance of PSY classes even more. Now you only need 4+6+8+10+12(+14?)=40(or 54) tags to have all skills. And I believe some of the people don't even want to spend those tags right now on PSY! (Usually I was one of those people. )