While it's fine to accept PayPal in your store as a payment option, you probably don't want to display PayPal's checkout shortcuts on your shopping cart page or product detail pages. These PayPal shortcut links will take the shoppers directly to PayPal instead of your NRO checkout page. If shoppers bypass the NRO checkout page, they can't select shipping options, enter promo codes, etc.

To disable the PayPal checkout shortcuts, select System / Configuration / Sales / Payment Methods and change Shortcut on Shopping Cart and Shortcut on Product View to No.