Freespace2 needs some sort of "Quick Mission" mode, sort of like the skirmish mode in X-Wing Alliance, where the player can easily make a simple mission by telling the game which ships they want in the battle, the environment(asteroids, minefield), and the ships' goals(attack primary target, is primary target, etc.). This could be accesed through the same place that can play single missions and stuff. I'm not sure how exactly it could be done, but one way could be to generate a temporary mission file after all of the options are set, and then load the mission into the game. This shouldn't be that hard for anyone who knows basic file operations in c++ and how to use FRED