Obviously the Open game would be better with ship-to-ship docking and optional trading of everything tradeable: credits, cargo, materials, fuel, ammo, AFMU ammo, SRVs, SLFs, even access to other ships' AFMU facilities, or trading of actual ship modules or ships themselves.
Such facilities would be most obviously useful for explorers and Fuel Rats in deep space, thousands of light-years from the nearest station facility.
And then Engineering of upgraded ships, for sale to players who can't be bothered to collect the mats themselves could become another career path.
If players are going to be flying in each other's ships in Multi-crew, why not be able to trade them altogether?