[Sev]

I've seen this once before only once on an 8vs8 server and I thought it was fucking brilliant.

It basically mixed the existing tank rules with the SI spawning ghost rules.

1. The Tank notification activates/music
2. Someone takes control of a SI Ghosted tank
3. With a timer that acts like frustration which differentiates it from SI, only faster/runs out since its going to be allowed to spawn like an SI
4. If said player doesn't pick a spot to spawn, it skips him and allows 1 more person to use him like frustration
5. If both don't spawn in with the tank, the AI Tank takes over spawning like a typical tank at a distance
6. Once the tank spawns in, normal tank rules apply, etc frustration, LOS, etc
7. Of course, you only get the one tank like normal
8. I didn't notice if its spawn radius was different from normal SI, to me it wouldn't matter much either way at least on lower levels

Seems like a no brainer. I'm surprised this never came to fruition during either games real peak points in playerbase.

[The 5th Survivor]

I've played on a server that does something very similar to this but for L4D1. I don't know the name of the plugin used, but at least it's possible.