Tombstone Myers: Right click to kill, and make it a universal grab action
This one is fairly simple in concept. When a Michael Myers with one of the Tombstone addons (be it the piece or the whole thing) is in tier 3, the now unused stalk button turns into a button to grab and murder someone. This eliminates the situation where Myers wants to kill someone but instead downs them and vice-versa.
In addition, make this new "Murder" button universal to all grab interactions while it is active. He can initiate any grab-a-Survivor actions (Searching a locker, pulling a Survivor off a vault/generator/hook save, lifting up a downed Survivor) with right click, and if he does so he immediately murders them after the initial grab animation is finished. I don't even play Myers, but it never fails to amaze me how counterintuitive it is that the safest you can be when he's all Tombstoned up is jumping into a locker or lying helpless at his feet.