Monk already has SSS and Meditation for disengaging.

The only issue right now is that if you end up disengaging with 4 chakra you end up kind of screwed. Allowing you to spend chakra early (similar to Perfect Pitch) or store more would alleviate this problem somewhat.

I think a case could be made for giving MNK a ranged ability for single player content, but I'd rather see it added via something similar to the Variant abilities.