@TheDog I still have not understood if, for example, a game with 4 sides with 2 players per side (total 8 players) would be a FFA-4, a FFA-8 or not a FFA in your classification. (I guess not?)
I still suggest NOT DOING this because it belongs to game (not map) classification. If you absolutely want to do this, then just give the number of players (or powers, polities, countries, civilizations, factions...) and number of sides (or teams, alliances...) in two distinct columns. FFA will be implicit when you have same number of players and number of sides.
However, IN ANY CASE, you have to decide what you are going to do in case of maps having games with different such things. Will you count Napoleonic Empires as a 8 players with 2 sides or a 8 or 5 players FFA?
Also, please no .2 .3... Use 02, 03...