No, I recommend that people use strict form at all times when lifting. I go by powerlifting rules for the bench press. Which are; the feet must be on the floor at all times, the buttocks must remain on the bench at all times, and you must have control of the bar at all times (i.e. no bouncing off the chest, etc.). Using crappy form to try and lift more weight is pointless, not only do you risk injury, but if you were to compete in a bench press competition the lift does not count unless it was performed with good form.