How about major trait options being unlocked on a pre 5 point invested basis? (2 new major trait options, not slots for every 5 points in a line) It would unlock a lot more flexibility in builds and build options since builds that go for 15 or 25 points pre line would be more common since they wouldnt be actually crippling the player that much.
When life gives you lemon, ask if its from a anime or manga.