Cart rule/ voucher / discount of Preferred currency and Payment Method

[ohgnow]

Hello
 
I wonder if it is possible to create a cart rule or voucher which give discount to customer who like to pay in my preferred currency or payment method
 
e.g. if customer want to pay cash , we certainly get rid of transaction fees like paypal or cards, i would like to discount them some percentage of the money
and i would like to receive currency in my own country rather than USD. otherwise we both lose exchange rates.
 
but under default cart rule module, there seems no such function for these.. or may be i missed something ?or any other module can do this?
 
thank you : )

 

( i have the same post under Free module section, but i just wonder if i should post here. therefore i repeated it once.)