Snare/Root/Stun/Holds Statistics
Would it be very difficult to include these sorts of things? One can imagine several ways to show these. As individual "hits", when a player uses any sort of stun/slow ability and it ends up affecting an enemy champion. Perhaps traps could be separated out into its own category. It could also be tallied as 'total seconds stunning opponents', etc.
Perhaps throws, fears, silences could also be tracked, but I can imagine how this sort of thing starts to get out of hand and it is difficult to draw the line between tallying each individual's successful use (limited to only quantifiable evidence, of course) of each of their powers. However, one might expect the level of competition should demand statistics such as these.