Hi there,
If I may, and to be perfectly clear, I am precising that the Bank Transfer Option consists only in displaying the shop Bank details, so that the customer can make the bank transfer on his own.
Then the shop is informed of the order and can proceed with the shipping once he has received confirmation that the order has been paid for.
So this feature is very simple: it's just matter of displaying a field containing some information...
Is this what you have in mind, and though, when will it be available?