As for the disconnect, it wasn't a rule when I played, hence it wasn't illegal... Just like tank parking was used in the early days of L4D, it wasn't illegal, people used it...

CyberGamer staff and ladder administrators have the ultimate say as to what a team/player does is illegal or legal, it is impossible to list all bugs and exploits that are in "Left 4 Dead" therefor we only list the ones that we have knowledge about. If it isn't added to the list above that doesn't mean its legal. Any player/team found taking advantage of exploits or found using any sort of hacks, will be banned for a period of time depending on the offense. If a team has knowledge that a player is using exploits or hacks, the team will also be dealt with.