Rise of Nations and AoE have an option to set a peace time, during which you can't attack your enemies.
Is it a feasible addition for TPC?
I see you have a WIP for "unstable alliances", which might come in handy if this suggestion is adopted, as you can make everyone allied at the start of the game, and reset to their proper alliances once the time is up.
Scorpion Clan * Courtier * Ninja * Experienced * Unique
"I am Invincibleeee!" - After two tequilas.