Nono, I meant the concept of fuel makes no difference, if I could still do it that would be fine, I just do not care. The ideal solution would be a docking port that just attaches, in a way a docking strut would, which could also get broken when ship A decides to fire boosters without warning Think of it like this: when the Space shuttle docked with Mir, they wouldn't become a slave to Mir. Sure, fuel MIGHT have been passed, maybe current, but in the end the controls that used these resources would remain where they were.