Scaled abandon penalty suggestion

Hello. I think it is unfair that a tank, who has very little wait time in DF or DR, has the same penalty for quitting than a DPS, for example. The DPS will have to wait the penalty plus his wait time.
The penalty could be scaled by the average wait time, so for example if the average wait time of a DPS is 30 min., a healer is 15 min. and a tank is 1 min., you could have 30 min penalty for the DPS, 45 for the healer and 59 for the tank, so that the real time each one will have to wait for a new run would be about the same.
This way quitting would have about equal cost for everybody. You don't even have to know the exact cost beforehand, you will know it when you quit: your penalty is...X.
A real mean player will sabotage so that they kick him with no penalty time, but there are not that many mean people willing to openly be seen as that.

As a DPS I have this 30 min "permanent" penalty time when trying to get into a party via DF or DR...

Or better yet, people could stop leaving dungeons in the first place. If you want to leave without passing Vote Abandon then you have to take the consequence of waiting for the Duty Finder penalty.
Personally I think the penalty should be stricter, because a party member leaving the dungeon just because they are impatient or frustrated ruins the game for everybody, and makes it so that whole party can't complete their run.

Tanks are scarce, hence the short wait time for them.

Why do something like this to discourage people to play tanks?

It is just going to make your wait time longer.

You know this will just make the tank shortage more acute, and increase dps wait times. You're punishing dps by proxy.

Yes, you may be right, tank's incentive to play would be smaller and maybe wait times get even worse. But most people don't choose to tank because they can rage quit with less effective penalty (really most people don't ever rage quit). Shorter wait times will remain there also for tanks, only the ones who plan rage quit or have the habit of doing it would be affected.

A tank rage quit is much more harming for the group, since they will have to wait more for another tank than for another DPS.

As days pass by I am more and more sure:

Get rid of that damn DF!
or
Build your own group and you won't never suffer from any penalty.