What version of PowerStore are you working with? In v3 you can change the gateway that is used to match the one you need. One of the cc only checkout options is Authorize.net. If you select this gateway then you will not have the PayPal button on your checkout page.
As for the credit card values you see in the select list this can be updated directly on the checkout page. You can just open this page and select the element then go into the property inspector to remove the values.