Why not? With decent technique the gun is going to be down out of recoil before you could possibly pull the trigger again anyway.
Your right I've never realistically tried to go as fast as I physically can, calling my shots along the way. I've pulled the trigger as fast as I can pull it, but put no effort into calling both shots (just wanted to see my fastest split). I've always valued accuracy more than speed in practice. Once I start getting bad hits I start slowing down. But I understand in practice you need to push it or you'll never get faster.
It's kind of like when someones says "You don't know what you don't know". If you never get up to that speed, you won't know what you need to work on to shoot that fast accurately. Am I making any sense??
I like this idea and I'm going to try it, but does it affect your live fire? Do you ever notice inadvertently getting a third sight picture in live fire?
Dry fire to me feels risky at times. I'm a firm believer in "Perfect practices makes perfect", since there are no holes in the target afterwards, it can be hard to validate your performance. I usually try to balance my dry fire with live fire, to validate my dry fire practice. But during these short winter days its been hard to get to the range and practice. So I've done a lot more dry fire than live fire lately. As I'm sure everyone has.
Any more tricks, besides the third sight picture, to keep yourself honest in dry fire practice?