Is it possible to exceed the player limit past 12 and maybe add 2 more people since I did notice there is some extra space that can have at least 2 more slots. If so does anyone know a tool I can use, or maybe you could just help me :P.
I don't think a loader would help much on this. Bnet prbobably has some check or other so that it refuses to let the player in a game if its full. Also I believe the multiplayer engine was designed to work specifically with 12 players, and changing a single constant might screw-up the system.
so... nope, max is 12 players, but if you want, you can make it 12 players and 4 computer players (neutral passive, victim, hostile, extra) and of course, you need to put tirggers on them for them to move :)