JD, we have used recognition targets for years, these are photographic targets of real people with real somethings in their hands. Gun, Knife, drill, badge, cell phone, pack of cigs etc... These are good resources for recognizing a threat, waking up in the middle of the night with any of the above in my home, and I don't know them, better have an excellent response to me and quickly not to take action.
We no longer do drills, supine, that is a loss, as the range no longer allows drills that allow the shooter to shoot past any appendage, no matter how safe we might have made the stage, good practice, but potentially a less than focused shooter could put a hole in him or her self.
Good question, and I look forward to more responses.