Is it possible to change the turns orders ? By exemple USSR play before UK or, Rumania after Germany ?

We are playing a PBEM game, and there are a lot of files beetween the german player and the italian player for playing minor countries (Rumania, Finland, Slovakia .....) and we would like that german player can play all his countries, send th file to the italian player who can play all his countries, too...

Is it possible ? How can we do this ?

Thank you.