An option to not start games with uneven teams even if enough players are ready

[Irbyz]

Sometimes a player goes spec after some people did ready up, making the number of ready players just enough relative of overall amount of players to start the game and then the game starts with uneven teams.

We still manage to have decent CA games with uneven teams once in a while though which would be impossible with such an option on.
However playing CTF or TDM with unevenly sized teams almost never makes sense.