One thing that always bothered me a little in those kind of game, is the absolute power of sensors. The only thing that matters is "range", anything within is automaticly detected.
So there is no advantage in having small fleets trying to sneak. There is no possible strategy of using asteroid belts for cover to hide from your ennemy. You are as much detectable with 30 Warshiphs with escort complement than with 1 scout fighters.
The only thing remotely close to this kind of feature is the "stealth mode" (also in-built as "cloaking device" in some games) which is only included in some special units.
Do you think that there would be any points to including some kind of range-related efficiency to the sensors, along with the stealth value of the target? (and multiple ships stacked in a fleet would have abyssmal steath value - except if they were all specificly designed stealthy ships)