Guys, stop...
You are now going to fix a symptom of a problem rather than a problem itself. Lets first start with as to why the general captain ragequit in the first place. I have quit as the captain of a ship several times. Is it because I'm losing? No. Anyone that has played with me knows I don't mind losing, losing means that I can and should learn. Losing is just part of the gaming process. What pisses me off to no end as a captain is people not following orders. There are quite a number of who have the hearing and comprehensive ability that is even below the abilities of insects found throughout the planet. Some people are repairing broken equipment with the mallet or damage equipment with a spanner, even if you tell them they shouldn't do that. And sometimes you get crew members that correct these bad engineers for you, but most of the times you are dropping out of the sky faster than you are used to. When my attention however is drawn to my crew rather than the ships around me, that is pretty much strike 1. If I start shouting and my crew still doesn't listen, that is strike 2. If my ship dies several times because of this, that is strike 3 and I'm gone.
I can very well understand that captains who are flying a ship full with people that essentially don't take orders leave the game. I have done this on several occasions and I have informed my fellow captain when this happened(I think). There's simply a limit to player's patience and that is perfectly normal. So having any form of punishment system is essentially just adding to the frustration of these players. I'd much rather have people focusing on the reasons why these captains quit and fixing those rather than fighting this symptom. And then we can have mods deal with the captains that quit to troll.