But when you are engaged by multiple cons, without ACM you may as well roll over and die.
What "ACM"? The only "ACM" against multiple cons in a bad looking situation I see around, even with the case of super aces, is:
1) run away if with superior speeder
2) climb away if with superior climber
3) partial extension so only one or two follow, and get them one by one
4) buy some time with basic evasives until the cavalry arrives
The rest of the multiple engagement situations with about equal numbers can be solved with simple teamwork and basic maneuvering:
1) watch each other's rear ends
2) lots of check6s and communication
3) don't do stupid stuff like going into an all-out maneuverung contest, dragging rest of your friendlies down to deck with you, so all of them die with you when enemy reinforcements arrive
Real ACM only happens later, when your side already have succeeded in significantly cutting down enemy numbers, so friendlies have a local numbers advantage for a short time -> in this case, some ACM starts, usually in competition against your own friendlies to gain the kill first.
Otherwise you're using the term "ACM" in a very wide sense which would be really more close to BFM than a real, all-out "combat maneuvering".