Yes, exactly, this kind of mortar. Weapon like that was used in nearly all armies, and now it's coming back (usually as an commando mortars).It gives quite good fire support. In defend - doesn't matter, but in assault it need to be portable. Quick position changing is a key to successful support.
1. If it will be a vehicle (created by user actions), can AI use it succesfully, without inmission waypoints or triggers (whatever)? AI should be free to use it.
2. there are many vehicles with special animations, but i didn't see any riffle, law or whatever with added anim. One can change whole animations (anims.pbo), but how do that with specifed addon?
3.Custom animation - i'll do that. i hope so