I've had plenty of thoughts of things I'd like to see added to the game, some big, some small.
For Pirates, they should be able to extort money out of people as well as cargo. Like some kind of "Give me 100,000 Credits or Die" auto comm option, and the target has some way to quickly transfer money to the pirate. I think it would be a good option for Open players in particular, because it makes it slightly less likely that a trader will be destroyed for his/her cargo whilst allowing pirate players another way to earn money. There should also be some kind of high end pirate gameplay, like perhaps a secret fleet of "private collectors" that require pirate players to steal specific things from specific places or ships. Perhaps rich Imperials fancy stealing unique Federation artwork from a specific station or whatever and will pay obscene money to proven pirates to do it. This would probably involve another wish or two I have, more faction uniqueness and more interesting traffic. If there were large cruisers, cargo ships for factions, etc, it would allow more ways for pirates to earn some chips.
Explorers, I also had a couple of thoughts. I think it might be interesting if in some occasional systems, an explorer found old derelict ships of explorers past. Like if they found prototype Asps, or earlier ships just floating out in space, having had some horrible tragedy that killed them and they were left to float. Also I assume that there would have been some larger vessels out there, maybe they could find one off sleeper ships, or old space hulks that were big enough and damaged enough to go inside, look around, find a few interesting items to bring back. Historical societies and organisations could be a way for explorers to earn more money by finding out about things that happened like this in the distant past. Hundreds of years of human exploration of space, there must be many old failed missions out there. Hints towards future alien contacts would also be fun. The occasional unknown ship type, either wrecked in space, or flitting into the explorer's view for a little time, then disappearing.
A general wish is for more unique looks for stuff. I really like visiting the small outposts, because they genuinely look quite different to each other. I recently found my first scientific outpost and it looks all shiny and futuristic compared to the grimy factory look of the industrial outposts. Special planets or systems, Sol for the obvious example, should have Star Trek style Huge megastations orbiting, since it's the home of the Federation and the birthplace of humanity. I'd like to see occasional mini fleets moving about, it could be a temporary instance in a system, as the main faction in charge does a patrol. Even something like seeing little shuttles leaving a station towards a populated planet would be cool. Occasional different structures in space as well, such as a shipyard or deep space comm relay or something.