Games : Is there a way to modify/disable the setup timer in TF2 as a server owner?

Not to be confused with the "waiting for players" timer or the "end of round" timer, the setup timer is the one where, during payload race, control point, or KOTH games, the attacking team is locked inside their spawn while the defending team gets the run of the map to set up turrets and otherwise prepare for the onslaught.

Is there a way a server owner can modify this timeout?