There's fun thing. I have written in my autoexec.cfg file:
bind g "summon doomimpball"
bind h "summon cacodemonball"
bind j "summon baronball"
bind k "summon arachnotronplasma"
bind l "summon fatshot"
bind v "summon revenanttracer"
now I can shoot monsters attacks!
It was fun setting up legions of marines to take on a boss monster. Now if only we had a summonteama and summonteamb command for easy team arena battles to enjoy and bet against.
EDIT: At least until Hate Arena comes out and lets people stage fights with a flick of the wrist.