Hi. I haven't scrolled through the entire list of suggestions, so I apologise if this has already been suggested.
In the game (not sure whether in the core game or added by OXP) you can buy various licences, such as the Escort licence, which allow you to access a greater variety of missions. My thought is to add an engineering licence.
Initially, the player would have the possibility of 'enrolling' on an engineering course for a fee. To add a bit of colour, the player might need to have Ship's library installed and have a 'course book' or two added, although, of course, the real training is done by hypnotic suggestion to save time. After a set amount of game time, the player would receive a graduation message upon landing at a space station (possibly above a certain tech level).
After this, the player is a qualified engineer and can stock up on alloys to carry out hull repairs (either on their own ship or a ship belonging to an NPC who will pay for the privilege) and on machinery to repair ship's systems. Some systems might also require gold or platinum for certain electronics, while lasers might require gemstones. Radioactives and Computers would also be useful for some repair jobs. You might also need to carry the appropriate engineering tools (with, maybe, different sets available for different job types) that can be purchased from the F3 Ship Outfitting screen.
You could have an engineer/roadside assistance career path similar to those for other roles, so that with more repair jobs you gradually become an elite engineer. At lower levels you may not be able to carry out certain repairs but learn to carry them out as you gain experience.
You could have missions similar to the "tow the hospital ship" one that is activated when you buy the towbar, except that, instead of towing ships to a space station for repair, you repair them on the spot.
Of course, repairs take time, so while carrying out a repair job you are vulnerable to attack unless defended by escort ships or any automated defence systems that can be set up. For certain missions, you might be assigned a Viper escort, while for others you might request an escort for an appropriate reduction in earnings for that job, You might have to fly around or fight your way through pirates, Thargoids or other enemies to get to a ship in need of assistance.
I haven't a clue about programming OXPs, or any other programming for that matter, so if any of you programmers think that any part of this would be a good idea, please feel free to take it on.
So, what do you all think?