Although rolequitting is minor in comparission to the others - I would say we need to make the rule more powerfull because it can be worse then "skyping" since town is heavily scarred.
Standard setups has at least 3 unwanted roles : Citizen, Doctors, Investigators.
Let's add some nightmare fuel :
--- When one leaves Day 1, Night 1 they get a [mark] on their name to know who's dead.
------ Naturally, Maf / Neutral Killer would target players without the [marker].
At the same time, when there's a mass rolequitters of 3-5 then most of the town follows with it because they know town are screwed up.
3-4X role quitters
1-3X rage quitters (due to role quitters)
2X town dead (due to Maf/Neutral knowing who's still on the game).
= 99% impossible town situation.
If you get the picture - then you know this happens way too common.
Basically, it's me asking if you would write a list of consequences of what would've happen to the game if rolequitters appear.
It's a mixture of Griefing / Gamethrowing now that I've made my point.