1-3-2: Introduce the "Heavy" Damage role

[Hypovolemic-1753]

The 1-1-2-2 variant I would prefer to see is Tank, Support (off-tank + control dps), Damage, and Healer:

1-1-2-2 Experiment (Long)

The 1-3-2 Experiment was pretty interesting, but 1-3-2 has a lot of issues I think are going to be impractical to solve. For the next Experiment, I’d like to see some incarnation of the fairly common suggestion of having split queues for tanks and off-tanks. Ie, 1-1-2-2. I don’t know that you actually need four queues for this. You can probably just stick to three and have the new role be filled by either the Tank queue (2-2-2) or Damage queue (1-3-2). Just let the players sort out who plays w…

It’s a pretty similar idea though. You can pool the queues into either 2-2-2 or 1-3-2 and you basically end up with the same situation we have now in the Tank queue, where someone locking off-tank forces you to pick a barrier tank. It’d be more explicit, and require a UI change, but no worse than how Tank picks current work.

Though, I’m not convinced 4 queues would actually be that bad. Sure, it’s absolutely true that 4 queues will make for longer matchmaking searches than 3 queues. But, that’s something they could reduce by removing role-specific MMR, which are 3 extra hidden buckets. So, plus 1 bucket for 1-1-2-2, but minus 2 buckets by just having a single MMR.

I think they could get it to work.