Toggle on/off option for "Agressive AI"

I believe that it would be only right to add option to tun on or off Agressive AI (AI declaring war) for custom games.

Custom games do not inflict players stats or rankings, for most of the time they are used for roleplay,practice or 1v1.

Especially in roleplay games, that makes an issue and I do not see reason why that cannot be added as an option when creating custom game.