I don't see any reason for it. Use Express Checkout.
You will have to use paypal direct payment local checkout in the checkout wizard, then just remove the checkout form associated with direct payments and leave the express checkout buttons.
That will have all of the advantages of paypal standard (no monthly fee), and none of the drawbacks (won't have to struggle with IPN).
According to the PayPal solution chart, you have to have a merchant account to use PayPal Express:
I couldn't find any information that explains how you can use it without paying a monthly fee to someone. This would be a disadvantage to those that use PayPal standard to avoid monthly fees.