Something Id like to see implemented is having jump look at how much of your movement has been used up and have that influence the reach of the jump. (DnD does have rules for running jump and jump from standstill after all.) Also jumps should trigger attacks of oportunity and disengage should be a separate action (not a bonus action).
Attacks of oportunity and positioning is a big part of the tactical aspects of pen and paper DnD, (and given that its a rather simplified combat system for the sake of fluidity its a bad idea to strip away even more tactical depth from it.
Non martial classes are supposed to care about positioning, not laugh at the oportunity attack mechanic as they bounce around like rubber balls.
