On the topic of refineries, the Advent's Resource Focus could certainly use something to make it not worthless.
Honestly I think Resource Focus could create some really interesting gameplay if it didn't suck ass- could be very dynamic, shifting trade posts on ice/volcanic worlds when you are in great need of crystal/metal, then shifting back to tradepost form afterwards.
Of course there might come a point in the game where some worlds(4 extractor worlds with high allegiance) it may be better to leave resource focus on all the time, whereas fringe worlds or 2-3 extractor worlds would always default to tradepost mode.
Honestly It could make the advent economy a bit better and a lot more interesting if Resource Focus weren't a steaming pile of shit.