You can get InstaKill by using CTF bases and (I think) 3D spikeballs in combination. Jazz gets instantly killed that way. I forgot how to exactly make them though. To see instakill "in action", check out FSP and play on hardest. Fall into the lava, and voila.

The plans about your level sound very cool, I'm really looking forward to it.

And don't worry, you'll this time get a review from me as soon as I played.