Flashbangs and molotovs you already know, 4 turns of cooldown.
If you have mechanics and 65 chemistry, you can craft incendiary rounds rounds to have a 35% to set target on fire and scare him off, but it's unreliable and 65 in chemistry is quite much. In my experience Blaine form underpassages sells it from time to time.
Dirty kick can be used with any weapon but if you don't have any points in melee you probably won't hit with it.
Kneecap shot to outrun single enemy.
My favourite is taser. 10 AP for short range 1 turn stun, with only 3 turns of cooldown.