For a Black Op to place a satchel charge, in a trigger or waypoint put:
unitname fire ["put","pipebomb"]
For the sitdown thing, try using playmove or switchmove instead of action, and you don't need the brackets if it's not an array.
A10LGB's don't do carpet bombing. You can script it if you want it that bad. In all likelihood, there's scripts for that already, or it can be done with triggers for a small bomb run.