I've run into this event a few times. There's an engi ship that automatically surrenders without a fight, saying something like "transfer of goods acceptable?" There are two choices, 1) to accept the surrendered goods, 2) to assure them that you mean no harm.
Every time this happens, I can't bring myself to take their stuff, so I choose the second option and they take off without another word.
Is there anything more to this event, or is the optimal choice always to accept their stuff?