Alright, since I've been on these forums for so long, I figured I might as well *try* to help...
not sure if this is any use (and it probably isn't, since I bet you've already noticed this), but in the VC bank-heist mission, when you leave the building, Hillary drives up, gets out, and shoots at the SWAT vans.
Thought this might be useful, since it may be one less character animation you have to figure out... or however you're doing the mod now