Roothog, I get what you are saying, and some of my son's his early instructors talked to him about "intent to throw hard and tempo" which is what you are talking about. I think you can get his by getting a kid to stand in front of a mirror and drive tot he plate with quick and slow tempo and you will get what you are looking for.
What I have seen in in the past year and a half with my son who went from a mid to high 80's pitcher who is now sitting at 91-93 and a lot of this had to do with hip drive, drive foot placement, (like anything there was a lot more but this is the most visible difference) I think you can generate that velo with good hard hip drive, and work on this vs trying to time them down a mound.