Ah, I see, the "calcuation" (or "formula") is hard-coded, but you can adjust the values used in the formula with the mod system. When I see "hard-coded" It triggers my dozen years of software engineering background which typically refers to "values" and not "methods." My apologies.
M&B's Module System is pretty difficult to deal with sometimes, especially after modding with systems that use Lua (much more flexible and easier IMO). I'm still getting used to all the different terminology and methodologies.
As far as map speed, when I played one of the mods, my map speed was 11, right out of the gate. Playing Native, I'm usually around 7.3. I realize that pathfinding has something to do with it, but there seems to be something in that mod that changed it. Was it encumbrance?