D&D hardcore as new difficulty option would be tremendous. There's plenty that irks me, such as not being able to drink a potion of feather fall and jump down a floor in the same turn. They've messed too much with bonus actions.
Yeah Jump shouldn't eat your Bonus Action. A more common scenario I've found myself in is that after jumping over a hazard you can no longer drink a healing potion or attack with your off-hand.
Jumping should be a free part of moving on every difficulty.
