Try these cvars
Code:
sv_vote_command_delay : 2 : , "sv", "launcher" : How long after a vote passes until the action happens
sv_vote_creation_timer : 30 : , "sv", "launcher" : How often someone can individually call a vote.
sv_vote_failure_timer : 0 : , "sv", "launcher" : A vote that fails cannot be re-submitted for this long
sv_vote_issue_change_difficulty_allowed : 1 : , "sv", "launcher" : Can people hold votes to change the difficulty?
sv_vote_issue_change_map_later_allowed : 1 : , "sv", "launcher" : Can people hold votes to change the map after this round?
sv_vote_issue_change_map_now_allowed : 1 : , "sv", "launcher" : Can people hold votes to immediately change the map?
sv_vote_issue_change_mission_allowed : 1 : , "sv", "launcher" : Can people hold votes to change missions?
sv_vote_issue_kick_allowed : 1 : , "sv", "launcher" : Can people hold votes to kick players from the server?
sv_vote_issue_restart_game_allowed : 1 : , "sv", "launcher" : Can people hold votes to restart the game?
sv_vote_kick_ban_duration : 5 : , "sv", "launcher" : How long should a kick vote ban someone from the server? (in minutes)
sv_vote_timer_duration : 15 : , "sv", "launcher" : How long to allow voting on an issue
For a list of more cvars check this page:
https://developer.valvesoftware.com/...t_of_L4D_Cvars