I asked this question in a post concerning castra and watchtowers but I received no answer

So I wanted to know if it would be possible then easy or difficult to make each year lasts 8 turns instead of 4 and logically, each season lasts 2 turns.

Also, since the game engine seems capable of detecting some situations happening to armies, just like seasonal restrictions, would it be possible to include movement restrictions for armies moving through enemy territories ??

And why is it possible to have admirals gaining traits but not captains ??

Thanks for any help