I miss...
Escape Capsules
In the original Elite you had to specifically buy an 'escape capsule' from a level 6 or higher Tech world which would be tracked by the nearest habitable planet and safely provide guidance to the nearest Coriolis space station. This came with insurance meaning you got a new Cobra class ship. Any cargo you had on your old ship would be lost but you got to keep your cash. Ejecting also meant clearing your Police record as the record was tied to the ship ID code.
Of course if you didn't replace your cabin with an escape capsule and you were destroyed you were tombstoned; start the game from scratch...ED definitely needs this. It annoys the hell outta me when you keep getting fines for 'murdering' an NPC or another player - they aren't murdered, they do a Cylon number and awaken on the resurrection shipjust like you and I do - no wiped record and a nice replacement ship if you have the insurance.
It was never possible to get other pilots to eject and steal their ship/incarcerate the pilot to sell as a slave...your thinking of the X3 games there (though I do like that gameplay).
Tech Levels
There were different tech levels worlds had reached, this had a direct effect on what items were available for purchase at the stations orbiting those worlds The higher the worlds tech level the more advanced items available.
The Wolf MkII
From the Amiga version of Elite.
I miss being able to sell the alloys you scooped up from your exploded enemies!
And These too. I loved the feeling of going to the trade floor and weighing in some dented and burned Adder panels and whistling innocently.