I liked the old system where we had "auto-transfers". This could have some changes with higher limits and a kind of contract. A Lord have an oath with his Duke and it's interesting to have a "contract" where every month or every season a certain amount can be sold since there is gold available for transfer. This can be done in RP? Yes, it can along the game mechanics.
And we have to find new jobs for the Banker, because control food is out of his office with the system we have now. They're useless. He cannot enforce anything without a good Judge to punish the Lords. Despite some special options, the Dukes have the same options to control food. Now the Banker is just a beautiful ornament to put in your Council.
