Suggestion: I think it would be cool if classes (even if only some of them) had another possible path they could invest points into. Depending on the class it would either focus on another aspect of the class or just be a balance between the other two trees.
Implementation: An example of how this might work is Paladin might get a tree that's more average in both attack and defence, and the hunter might get one that focusses more on their bird (more attack orders and other skills related to the bird rather than the bow, I mean the class is called a hunter and not an archer).
This could open more possibilities for how a class is played. Since most class roles have already been covered in this game, this may be a way to have more choices in playstyle without having to make a whole new class.