The list of paypal standard variables can be found here:
https://developer.paypal.com/docs/classic/paypal-payments-standard/integration-guide/Appx_websitestandard_htmlvariables/
I'm looking into the radio button issue. I'm going to have to get a new build out to address it.
It appears that even though the radio isn't correct in the UI, the resulting code is correct. That should set the value of the hidden field "srt" and set it to the number selected in the list.
Did this help? Tips are appreciated...
