I haven't done this before, I have a Khajiit running a UseWeapon package on a archery practice target. I've messed around a bit with the settings and basically managed to get him ready to fire but he doesn't fire. The target to attack is an xmarker inside the target.
https://onedrive.live.com/?cid=b60c11d037429d8e#cid=B60C11D037429D8E&id=B60C11D037429D8E%2130680&v=3
Little confused here, I can make actors attack each other but not fire at targets.