I have added a match config that is used by L4D leagues to |H|H| L4D #6 and have added a sourcemod plugin that allows you to "ready up".

At the beginning of each map in a match, the game enters a "ready up" mode. All survivors are frozen, and the director is disabled. No players can take any damage during this time. When every player readies up, a countdown will begin, after which the director is enabled again and the round restarted twice. The match is then considered live for the rest of the map.

COMMANDS
During the ready-up period:

!ready - change player status to "readied up" (when all 8 players are ready the round will start)

!unready - change player status to "not ready" (if going AFK or want to abort live countdown)


(Admins:
Use the 'Exec Config' option in the Server Commands menu of Sourcemod to load the match config.
Please also remember to load the standard config when the match is finished.)

Cheers frog!

Nice one mate