I finally got around to adding !modes to both Valkyrie X L4D2 servers. It's the same as the L4D1 servers. Default mode will enable the other SI plugin that will depend on player count for the SI limit and spawn time

Nirvana - Spawns 4 SI, fast spawn rate, every 30 seconds
Purgatory - Spawns 6 SI, fast spawn rate, every 15 seconds
Inferno - Spawns 9 SI, fast spawn rate, every 10 seconds

I might add 1-2 more modes just to play around with when I have the time to. For now these 3 are enough. I will be adding more things to it little by little still and fixing up some of the bugs when I can.