Rally points are nice, but it'd be great to have a 'patrol' option for my ships/fleets. That way I could tell a ship to 'patrol' and choose, maybe, the Border Worlds; or maybe All Planets; or, perhaps Trade/Shipping routes.
That would be pretty cool to have 'coast guard' type of ships that had long range, moderate speed and armerment with good sensors that could patrol around my empire, looking for baddies hiding in the fog of war.
Mmmm...no more fog of war! Delicious! Can I get it in red?