Okay, I know this sounds a little WTFModish, but I decided to throw it out there, if only for the 'lols'. Here it is: Perhaps have the firebug set zeds on fire using his welder? I keep hearing people suggest a blowtorch, and it occured to me that a blowtorch and a welder are almost the same thing. And I don't see it being a major balancing issue; a firebug has too litle survivability to really abuse it.
Just throwing it out there
Just throwing it out there