If you for some reason dont want to use your APs in a turn, you should have an option to put that toon on "ambush" or "observe" mode. What that means is that within the field of vision that toon react to any movement and automatically use the chosen weapon with the current mode of firing.
Field of vision is either O or <.
The idea is that you use all the APs in a turn for this, not just 1 or 2 points you happen to have left after acting in that turn.
Why?
Tactical dispositions.
Clarify?
You get to blow shit up when its not your turn.
Why?
Teamplay requires coordination, this adds depth to that.
So?
If people are running sequence builds this will counter the sequence advantage of having 2 turns in a row to some extent. Forces people to think before acting.