I imagine this wouldn't be too hard of a mod to make, seeing as jet already has the slow-mo effect covered. The purpose of this would be making AP useful for people who don't like the V.A.T.S system, and for total badass-ery. Of course, the AP consumption of the slow-mo mode should be a bit high, though not too much, seeing as V.A.T.S doesn't take THAT much AP either. A mod like this would be complete godsend.