I think that there should be a wider range of escorts, for example having to escort a colonisation fleet a system or so, or protecting a freighter fleet or even escorting an Ares agent who's come over to our side (which you only find out after you accept).
I also think that we should be able to transport the cargo (and/or people) ourselves. Like, becoming a freighter yourself, possibly getting someone to escort you. You can get missions like "You must take this experimental reactor to the scientists at the Civilian Research Agency". For the more ordinary cargo missions, like supplying commonwealth stations, the cargo is put in your hold. The amount of cargo is dependent on the size of your bay - the cargo takes up a percentage (25%?) of your maximum capacity. This would avoid making the freighter unbalanced, though I don't know if that's actually a problem.
Extending the idea of taking the cargo yourself, maybe you could have two paths you can go along in Korolev - that of the Freighter, and that of the Escort


Finally, I think for roleplaying stuff there should be a Korolev HQ in St. K's. That would be so awesome, seeing this massive starport thing

Maybe if you've become president or something you get your own room and stuff.