The problem with HRod's heater is that if he takes some of the velocity off to gain some control he's going to be very hittable but much more accurate. I'm just glad he's starting to get it together but I don't trust him in any game that's close.
I don't think there would be anything to gain by trying to diminish his velocity. If he was a max effort guy (ala Mitch Williams) I'd be all for it but Rodriguez has easy gas.
P.S. Thanks Heeman82 for the video