I have 2 issues with magento and a onestepcheckout module.
Issue 1: When I apply a discount shoping cart rule on payment method it's not applied when I switch payment methods on the one step checkout page. Only after a normal refresh it;s applied (so not correclty with ajax)
Issue2: Onestepcheckout send the shipping cost excluding tax to paypal express. This should be changed to inlcuding tax.