Okay, I have been thinking about this for a while, but...how about we canonize the whole zed-teleporting business and make-it-obivious?
The in-game story consists of a biotech company with buttload of fancy stuffs, 2 mad scientist with no regard to morality and in general wacky bull****ery that adding a teleporter won't seem to be too out-of-place. An obivious, in-your-face sign of teleporting (loud sound, big flash, "dazed"
zed) make it less a buggy nuisance and more of a valid tactic that you need to consider. So, make it canon that Han and Pat can and will teleport their troops around in order to corner you. Make it canon that they will freakin rain zed above your head, telefrag be damned, if you try to hole up a place too long for them to reliably predict that you won't change position anytime soon.
The game conductor, as of right now, seems like a whacked up mute-and-invisible A.I with no personality who is unreliable at best. How about giving it a voice?
Say, is it a little...underwhelming for Pat and Hans to just, you know, pop up suddenly in the final wave without much prior warning? With not much of a build up?
How about giving their voice to the game conductor?
Make them more..interactive. Make them talk, make them gloat, make them mash the spawn buttons while foaming out their mouth watching you survive everything they can throw at you.
Make you realize that you have make them mad enough to actually leave their throne to personally go kick your butt.