Fovean said:
How about this - each level of Engineer (ship systems) is limited to 100 tons of ship? Eng (ship sys)1 = 100 tons, Eng (ship sys) 2 = 200 tons, etc.
Clearly, nobody's really thinking about the things that are possible, but only looking at what is not - not leaving things alone, but trying to fix what ain't broke.
Nothing stops the Scout character from brushing up on more straightforward specialities and having Ship Systems-3, Jump-2, M-Drive-4 even. With the more conventional specialities, the Scout could decide to invoke one of the conventional ones if the problem lies entirely within that speciality, and default to Ship Systems if the problem lies in one of the components he doesn't have a rating in, or one where the rating is weaker than ship systems and he hasn't got the time to play the learning curve game.
So the above Scout needs to coax a little boost, say 120% performance, out of his ship's M-drive to get him to the planet before all the air runs out; he could use Ship Systems, but since the problem lies entirely within the field of his M-Drive speciality which is his strongest Engineering skill, he uses that knowledge to get the boost out of the drive. Since his Life Support speciality is subsumed within Ship Systems, that is what he uses to coax the atmo processors into giving one last feeble whine of life and sustain internal atmo for even an extra hour.
If he needs to Jump in a hurry to get away from that Z-fleet that is still bearing down on him, it's Ship Systems. But if he's just making a routine Jump back to base, or he's down with the maintenance crew at the base to help them tear out all the modifications he'd had to make to the Jump-drive to get him back home, he can call on his Jump speciality to make sure she's going to work smoothly next time.
And if he were assigned to a Naval vessel as a representative of the Scout Service (a "Scout Aboard" program or some such) and something went wrong in Engineering, he could be asked to assist with the M-drive (which he'd have level-4 in) or help out with the J-Drive (which he'd have level-2 in) but the Navy would not ask him to work on any of the other systems, despite his intimate familiarity with anything ship-based, simply because they would not recognise his Scout Service rating in Ship Systems as valid or useful while he is serving on board their ship. And if all he had was Ship Systems-3, neither of the other two specialities, they would not call on him at all for engineering assistance.
Sometimes, you have to look outside the rules and bolting on mechanics here and there where they are not needed, and think about what people would do.