Hehe...I love myself!
"First, an intrasystem jump can occur between two points in a star system. Most small, space-faring vessels are equipped with motivators capable of these short jumps. The presence of an intense gravitational field is required, prohibiting travel beyond the boundaries of a star system."
That's what the Species.tbl says about intrasystem jumps.
In intrasystem jumps the presence of an intense gravitational field is required. But we know that some star systems have planets, while others not. We know that stars are different(giant, supergiants, Sun-like stars), thus changing the gravitational field.
As consequence, there's a certain gravitational field in each system. Though there's no canon evidence, we know that jumping to Pluto, Sedna or Quaoar would be difficult for many warships, so the areas under control have certain limits and are somewhat easy to patrol and control.
But what if we take in consideration systems like Antares or Betelgeuse? Those are supergiants, many hundred times as big as Sol. Their gravitational field is different, so the regions that can be virtually reached with subspace jumps change. I know that systems like Antares aren't supposed to have planets(though there are some in the FreeSpace Universe)but their gravitational field should remain intense, no matter of the presence of planets.
I wonder if in systems like Antares hiding a fleet is easier. We know that long range sensors need time to detect ships(star systems are immense), so reconnaissance craft are needed. But, in an immense system, succeeding becomes harder. What do you think?