Sectors used to be locked into a rather small area but now there is no reason to have them set low. As far as I am aware larger sectors actually improves performance and it definitely makes jump drive much more useful (in several cases with the default sector size I could fly the distance back after a jump before I could charge it again).
Perhaps limit the number of stations in a sector in direct relation to the size of the sectors. With Gates being stations it would be nice to have several in a single sector, although I would much prefer gates being multi-destination.