Standby is now rather... weak. A unit can move between two buildings at range 1 from a standby unit and not be shoot at. It can move beyond range 2 and not be shoot at. It can shoot first then the standby is lost by suppression. It can enter in melee so no shooting.
what if the standby was more of an „interrupt” action, so you can use it during an enemy movement, (not just at the end of it) and eventually roll a 50/50 dice to determine who is shooting first when the enemy is shooting?
this way it will be more in line with the intended overwatch effect.