Seems like a good idea for those mods that are easy to flee in.
However, I would prefer this to be an option you could turn on and off whenever you want.
Imagine having this in a spar 24/7, it would be ridiculous. Since most spars are based on looking nice and not points, this would be ineffective there.
As well as in some mods where there just isn't enough room to gain velocity towards the other player, or where most matches end with one player being pushed away from the other, which would encourage shoveling as a means of victory.
Jousting would be bad for this as well, since both players are launched at high speeds, which would cause no difference in the outcome of the match either way.
Overall though, seems like a good idea, would be nice to see this implemented.