We used dafe's script for longest jump to decap since it was being beaten by small amounts, unlike something like farthest accurate throw which gets beaten by like 1000 ED each time so we didn't think it would be necessary to be extremely accurate with it. In this case, we could probably stick to measuring with dafe's script and if necessary look at the Y values of the body part farthest from 0 when he hits the ground.
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I'm thinking the better strategy for this would probably be to do a manip with lots of momentum and then throw Uke at some point, in which case it would be measured from the frame after Tori last touches Uke, until Uke touches the ground. Like the replay below (just an example, I cheated by removing the dms that happen when my elbow touches Uke's pec).

The problem is that it might not be optimal to eyeball it since Uke is in the air and the ruler is on the ground, so we might actually need to check the Y values in most cases.