The first time you (or anyone in your crew) turn(s) in treasure, you should get a random button prompt. If you don't press the requested button, you'll be flagged as AFK in the game after a certain amount of time and will be susceptible to being kicked by vote from the game by your crewmembers. If kicked, you will lose any rewards or reputation that were delayed from the AFK flag system. You will be unable to receive rewards while flagged in-game. If you press the requested button, you'll be free to receive rewards (and those received while flagged for being AFK) from turning in treasure and will not get another button prompt for 15 minutes.
"But what if I go to the bathroom or something and my mate turns in treasure, making me 'AFK' so my crewmembers kick me?"
2nd suggestion: a selectable AFK mode. The AFK mode will flag your character for being AFK and will allow your crewmembers to vote to kick you if they wish (same system as the first suggestion), so use it carefully and only if you know your crewmembers are ok with you going AFK. Again, while flagged for being AFK, you will not be able to receive rewards until you press the required prompt to remove the flag.
If you don't communicate that you're going AFK and get flagged then kicked, that's on you.
