It'd mostly be used to instantly grief CMDRs. So I'd say no to such mechanics for PvP.
However, If you could do it to NPC's, we'll find a meta to steal everything. Which isn't necessarily a bad thing.
In X3:R (and others) you had a chance an NPC would eject leaving the ship empty for the taking, heavily damaged, but empty. You'd simply transfer over and fly it home to repair and sell or utilise. It was quite balanced, but you could still make more money from ship theft than most other things . Lol
For it to work in ED, you'd somehow "hack" the ship to allow control, after the NPC ejects(which would be exceptionally rare), then I guess send a crew member over to pilot it. (send them via limpet or something...?. Lol).
You'd then need to get it in as good working order as possible with repair limpets.
Once done, you can order your NPC to fly to a specific starport, only a few would accept stolen ships, and the cops would be after both you, and your stolen ship and crew. Loss of the ship is also loss of that crew member, and only Dangerous+ crew members can actually be ordered to steal a ship (reason to keep them, and added risk).
Assuming you get it back to base safely, you can then sell it for a fraction of its original value, or simply fly it, with a permanent wanted tag and no rebuy.
Shady places will allow you to outfit it and repair it, at an additional cost, but they can never be replaced via the rebuy screen.
You could also do this to abandoned ships you stumble across, which would be super rare, but far more legal, providing you dock it and register the ship for a large fee. But then it's perfectly legal.