I don't think it would benefit you that day, but as @Roger explains, as part of overload/underload it may help over time.
When you watch MLB hitters in the on deck area, they may loosen up with heavy bats, weighted sleeves, or other implements, but you rarely see them taking full cuts with them wihile on deck. At the youth level, most kids use these same implements and try to swing from their shoes to increase their bat speed or make their bat feel lighter at the plate. This seems to generally result in being the conductor for their own timing train wreck.
I'm not sure I'd engage in much over/under load training on game day.