What I had in mind is a new "AFK" yes/no toggle line in the crewmenu, just like brigging a crewmember. If the majority voted yes the player turn ark and is not able to move anymore, but at the same time cannot be disconnected for inactivity (They are still part of the crew and get the same rewards).
I really wish this was a thing because: I usually play with friends and we have run into the same problem over and over: someone has to leave for a bit to eat dinner or to go for a walk with their dog and have been disconnected after coming back. The rest of the crew then waits for them to reconnect before they complete a quest or turn in loot.