FSD Space Tugs
Someone has probably already suggested this… but I've not spotted it. I've seen some talk of really big ship transfer vessels, but I'm not sure that these make in-game economic sense. Surely the companies making them could also clean up on bulk goods transport, undermining Elite central premise of the independent CMDR? (Although that might explain how many of the bubble's economies do manage to function—given there's rarely a reason to bulk ship low value cargo currently…) Also, I doubt we're likely to see these huge ships in game anytime soon—even once ship transfer is in effect.
So anyway: FSD Space Tugs!
Imagine little FSD tug ships: really small, maybe only Viper sized. Basically all FSD and full tank, with the minimum power plant and thrusters necessary to function—think slower and less manoeuvrable than a Type-9 in regular space.
But what they can do is attach themselves to larger vessels and 'pull' them into massive hyperspace jumps. What's more, several of them could work together to transport the larger vessels and/or to make bigger jumps.
This could easily explain the ship transfer process making bigger jumps than your own ship's FSD can, but without invoking huge 'invisible' carrier ships, which really ought to also drastically alter the dynamics of interstellar trade.
Thoughts?