Did I overlook something or is my only option for PayPal Payments Standard to use my email address. When I create buttons on the PayPal site allows me to use my email address or account id and I'd like to use the account id. Does Shopping Cart Creator allow me the option or where do I go to modify the file directly once the shop is created? Please advise.

You can use PayPal Express or Website Payments Standard for PayPal. PayPal buttons is something complete different then a shopping cart. Click the little ? icon in the software where you configure PayPal and it will give you the steps.

All shop modifications must be made in the software itself. Nothing can be changed outside of it.