Increase of system/planet/bases size would be nice idea. because when I see Legate undocking from Crete and Legate have half-planet size its meh...
but Spirit! correct. there would be crapload of work to be done after it, so like NPCs would not fly into Planet, patrols will patrol not empty space and so on... In PlasmaFire mod there was really good sizes of things. but there was big gun ranges also and increased speed.
I think this addon would be nice, but noone would like to spent a week to make it. I would better see player ship detection on radar descreased to 10k not to 15k.