Parameters tab in shopper edit - What is this for?

[alexanderflr]

Hi,

I found a tab called Parameters when edit a shopper, please see attached. For what is this and why is empty?
It's something to do with the fields virtuemart_shipmentmethod_id and virtuemart_paymentmethod_id from table virtuemart_vmusers?

Thank you,

[alexanderflr]

Maybe someone knows why I have in the database virtuemart_shipmentmethod_id and virtuemart_paymentmethod_id from table virtuemart_vmusers? 
Thanks