I was thinking about other options we can handled it in the terror dome like:
1) Survival mode
Were we can fight infected hordes only using a weapon.
I am level 60 and if I enter in the event it will start on level 60 and increasing 1 level each round.
Each round longer 1-minute and the rules are:
No gear, no heal and no books (just like woody Hackett style).
The player can bail out in the moment he want like normal terror dome.
The level can reach the player is the reward he can obtain.
2) Game mode where you play with the ten survivors:
This kind of mode is like defending compound but with elite infected and explosive infected, besides of the normal infected like riot, walkers, bruisers, herc, etc.
You will survive different rounds with a huge amount of infected and high chance of spawning elites (more than one per round).
The only rule is no healing.
Each round longer 1 to 3 minutes.