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If you could get batFx data on verticle angle of batted ball off bat, get more granular than ground ball...line drive...fly ball...pop fly for balls in play. It would give you a more nuanced sense of a batters skill in squaring up the ball and how many easy outs they are likely to make; conversely, it would give you a more detailed idea of how good a pitcher is at messing with hitters. We have macro data now, but not all ground balls and fly balls are created equal. Some are more susceptible to easy outs while some have a higher likelihood of being hits.
It would be revealing to see a stat that distinguishes good groundball outs from dangerous groundball outs from pitchers' perspective. It would also help us see if this clarifies BABIP statistics. Perhaps two groundball pitchers A & B are really different pitchers with one whose game tends towards groundballs through the infield (because more of them are sharply hit but not line drives) while the other guy's game tends towards the three-hopper. 
Maybe this already exists and I just don't know it, since I'm not a guy who hangs out at Fangraphs.