Have a built-in method to conduct in-faction battles, setting teams, allocating equipment etc to allow factions to conduct large-scale training exercises. And couple that with non-lethal weaponry that can give some kind of indication of damage (like paint projectiles for all types of turrets or something) so that you don't have to destroy your own ships while conducting exercises. Would also be a good way to enable organized competitions like a dogfighting league or something.