I post here the house rules we are testing in our game of the full campaign of Empires of Apocalypse. Maybe someone could be interested or could have some suggestion. Subs may stay an unlimited time at sea. However, in general, subs have to end their movement within 3 zones from a friendly port.
Transports carrying troops are transports carrying only troops.
Engineers do not count against this limit, tanks count double. It means that Italy cannot use these troops in Russia without paying diplomatic points. Until it happens each month a die is rolled during the political phase. A result of 1 implies that Italy has now two complete months in order to declare war to one of these minors. If Italy has previously attacked one of these countries no roll has to be made and the requirement of attack is fulfilled.