How to help Kha'zix with a simple change involving masteries

This solution, I think, will provide kha'zix players with an interesting coice of masteries, including a way to go into the ferocity tree without having a wasted keystone for the sake of some burn damage, some on hit, or some on crit healing.

What is the solution? The solution is to make kha'zix isolated q count as a crit, similar to how karthus isolated q and anivia frost e are considered crits, if kha'zix's isolation q is considered a crit, it would provide some healing off of the warlord's mastery, which would be some good in fight sustain for an ad champion that can't actually easily sustain himself. It would also allow him to go for the ferocity tree jnstead of the cunning tree.