One thing to consider is that offensive/exploration Jumpships would want to have astronomical gear and good computers on board, to try and spot any Pirate points. Instead of spending ~10 days to transit from Jump point to target planet, the Jumpship would arrive in-system, plot a pirate point while charging, jump to that pirate point, and then launch the invasion/raiding force. If you are raiding, you should have the rough dates, and a good enough astronomy database will tell you where the target planet is.
Surveying a brand new system would be difficult as you need to figure out the plane of the system, and from there you have to search the doughnut to try and find an inhabitable planet (star emissions can be observed, and the Goldilocks zone calculated easily). As a result, there would be a demand for old Star League charts, as those would have most of the survey data already present.
Trade would be conducted in a similar manner, but with freighters contacting an HPG center to crunch the numbers needed for a Pirate Point to Pirate Point jump. So whoever is in control of communications would wield massive economic power. Comstar might even as a courtesy send a notification to the receiving system that a freighter was inbound, along with its rough description (and if the Jumpship keeps providing the wrong description, they are fined and eventually blacklisted). This means whenever a planet change hands, this disrupts the trade greatly as the existing networks are not just politically severed, but trading Jumpships often can't get easy access to the system as well. So new networks have to be developed in the capturing empire's region, and in the meantime the planet is trying to make something work. Expect border worlds that trade sides often to be very self-sufficient because of this. Not high-tech, just self-sufficient.
