Badass! Can I make a recommendation for two future features?
Feature 1: Asymmetric map. Ideally, the landmass should be asymmetric to make it more interesting (but the mex distribution can still be fair.) I can also propose a basic mechanism for identifying "fair" mex distribution: A scoring system that ranks mex by proximity. For example, you could use three areas - Within 20 units from spawn, within 120 units from spawn, and within 500 units from spawn. Mex within 20 are worth 3 points, mex within 120 are worth 2, and mex within 500 are worth 1. You should run the calculation from all player small circles first, then all player medium circles, then all large circles. And don't count any mex twice (Player 1's mex shouldn't count in Player 2's total.)
Feature 2: Asymmetric spawn assets. FAF normally just spawns an ACU per player. To make a more interesting (and unranked) game style, you could provide a small base to players on one side of the map and a small mobile force to players on the other side. Mapgen should probably have to generate 4 bases per player, one for each faction, and then spawn whichever of the four that matches the player's selected faction.
As an aside, feature 2 (along with the map marker generator) would work as a precursor component to a single player/coop mission generator.