visiting this page https://forum.civicrm.org/index.php?topic=34814.0 Coleman said "PayPal standard feature is being added to Webform-CiviCRM right now, should be ready sometime next week." It was on November 14, 2014. Any news/update on this subject?
I'd say it should be ready for you to do some testing with. According to this ticket it seems like Paypal Standard functionality should now be active.
(Caveat: Webform_Civicrm is not yet fully compatible with CiviCRM 4.7).