[Crystal232]

Under Knowledge; have 4 extra skill points for each class[basically one class gets 40 or 55 total points] - HOWEVER you can only have those points on one class at a time and it'll overwrite said points if you go to choose another.

It could be called "Specialist: Class Name"

[Raigen.Convict]

Finally I can be a true Demon Hunter and use all 4 Stances and all their skills!

[Snake]

This can bring horrible bugs or exploits, so even if it is a cool idea, I believe it could be tempered to something else more bland.

For example, not being limited to classes but being a flat addition to your Skill Points in general, like you can obtain Talents or Traits.

[Raigen.Convict]

You exceed the threshold of this profesion and while monoclassed gain 5 more skill points. (destiny makes 20 with this change.)

[Raigen.Convict]

5 more obtainable levels also works.

[Sawrock]

I prefer having specialists within a class itself, so I'm personally against this idea.