Well, there's signing in to as "member" and there's giving info to make the payment. These are separate items and I suspect that some customers will not complete the sale if they have to first become a member. Perhaps just 1% of customers, but it would still hurt sales. I can show you scores of sights that don't require the annoying step of having to become a "member" first.

Paypal itself has recently given the option of not having to become a paypal member first before the customer sends money. Now, the customer can just enter all their information as they would normally to send a credit card payment, whereas in the past they'd have to create the username/password, etc. to become a paypal member. Paypal isn't happy having people not sign up with them, but they recognize the hassle of doing it any other way.

Is there any way to turn that feature of oscommerce off?

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-Daniel Peterson
I'm an American in Bangkok with a successful business connecting international customers with Thailand products. By Thailand products, I'm not talking about silk Thai elephant hats, I'm talking about just about anything you can think of in the world. Asia has become the manufacturing base for the world and I have connections to many genuine wholesale sources. I specialize in jewelry but am interested in any and all ideas. Contact me!