Using Pay Pal shopping cart in Market Press Lite. Can it be done?

I've just found out I can't customize shipping shipping other than offering Flat Rates in MarketPressLite.
Is there any way I can change to a PayPal Shopping Cart, and therefore be able to customize shipping prices?

Stupid question but...I've already established there is no way to change the Market Press "Buy Now" buttons to a Pay Pal "buy now" button, but is that the same thing as not being able to change the entire shopping cart to Paypal?

I assume if I have to change over to full Market Press to be able to have a Paypal cart with customizable shipping I'll be starting over from square one, right?

FRUSTRATING. Haaaaalp...PLZ and TY