As the author, I can say that MaLa tells the plugin what type of game is being played (4-way, 8-way, 2-way, etc.) and it applies a map file accordingly. There are default files installed named 4way.ugc, 8way.ugc, etc. (or at least close to that). If you want a different map for a game than what is being applied by default you create a new UGC file and put the correct maps to be applied. This new file would be called <romname>.ugc. But, basically, the plugin usuallly just works and the fact you can't tell if it's working or not is probably good.