HarassCombo Tab > LastHit:
-LastHit Hotkey: by default is X, can be set to anything else.
-By holding down the key, you will lasthit minions if they're killable.
-Enable LastHit: by checking this, you will enable the usage of the lasthit key (whatever is set to)
-LastHitMinionMarker: if you enable this, whenever a minion could be killed with an attack, he will have a white circle around him, working like an indicator.