We are currently using preferred banks mechanism for Operating Permissions only.
Our design is to expand this to more places. The idea is to have this system replace your hand at places where turns are not needed. This means that every action that generates a lot of gold coins for the hand, without the use of a turn, will fall into this.
Here are the top 2 actions in mind:
-Credit Exchange
Buying/Selling credits will only be possible by using funds at a bank account. This will save turns in withdrawing/depositing when using the exchange and it will actually enhance trading.
At the other hand, it will no longer be possible to sell credits to get gold coin at hand during an attack.
-Gold Bars Manual Sale
Selling Gold Bars manually will no longer return gold coins at Hand. The market will instead use Preferred Banks and store your income there. Buying will be directly from hand.
No fees for these
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These particular actions, will incur no fees for the bank/nation.