The Mac trackpad has lost of gestures that could be mapped to commands in-game. Like 4 fingers-up: Heal Skill, 4 fingers-down: Skill 8, 3 fingers-right: dodge right, 3 fingers-left: dodge left. Something like this. And let the user choose what he wants map to.
I really love to play in MacBook but I miss the use of hardware features already built-in in the Mac.