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I am try to give customers who pay by Bank Transfer a 10%.

Ideally i would like this to show on the final total when the customer selects this payment option, i don't mind having to use a coupon code or discount rule to achieve this however i would want the coupon code/rule limited to this payment method to stop everyone using it.
I can see you can limit the coupon code use to some conditions but not payment method.

Before i start hacking at the code i thought i'd ask if anyone has any good ideas how best to achieve this.

Cheers

Narry a clue I'm afraid... Would be interested in hearing what you came up with in the end though...

Unfortunately after looking at the code i've not really been able to get anything to work. I think this is going to have to be something that i'll have to play with long term...

I have set up some jquery to display a <div> containing some more info when the option for bank transfer is selected, unfortunately this doesn't effect the order total.