Regarding crew salaries. I suspect the biggest hurdle in FD's mind was the salary model.
In FE2/FFE, one crewman cost between 5 and 20 credits per in-game-week. Given that it took a week in hyperspace to travel your maximum jump distance and then a few more days from the jump-in point to a typical inhabited planet back then, it amounted to (roughly) that much money every time you jumped from one system to another. Now, the credit has seen a 1000% inflation rate since then, so let's make it between 50 and 200 credits per jump. Maybe 500 to 2000 credits per hour? Which still isn't very much.
Now the problem with fixed salaries in ED is the 1:1 flow of time. If you hire a dozen crew in FE2 and go on a holiday from playing the game for a month, your bank balance is unchanged when you come back, since time is paused while you're not playing. If you hired a dozen NPC crew in ED at 2000 credits per hour and went on holidays for a month, you'd come back to the game and find yourself 17 million credits poorer. Not everyone can afford losing that kind of money. Fixed salaries are a no-go in an always-on game, which is why the NPC crew we currently have is run on a percentage-of-earnings model. I suspect any other crew we hire would have to be the same.
FE2 had a hidden "reputation" score, which was galaxy-wide. Having a high reputation made bulletin board missions spawn more and "job wanted" ads were in amongst the other bulletin board items, so a high reputation made it easier for you to find crew. Firing crewmembers reduced your reputation, so constantly swapping between big ships and little ships (you were only allowed to own one ship at a time back then) severely trashed your reputation.
Regarding crew jobs: I'm still hoping to hire a "science officer" to take with me while exploring. They might make scanning things quicker, and perhaps detect anomalies from further away. Maybe even be able to tease out from orbit the locations of permanent POIs like barnacles, crashed ships, abandoned bases and such, once they're experienced enough.