Suppose someone would like to do so, then what? But let me tun that on it’s head:
There’s going to be one or two mercs that will fit in a particular set of weights just right. You’re going to be seeing situations where only that particular merc is going to end up standing a chance at the top of the ladder. Playing that particular merc full time won’t only be an advantage but a necessity for a players that want to go for the top ranks.
And the worse thing is that there may even be other specific mercs that may contribute more to their teams but just because the weight set is skewed they’ll be unrecognised.
My point is, any modifiers you add on top of xp/min is going to be arbitrary. The sub categories for xp are already arbitrary and can only approximate accuracy through lots of trial and error.

