The buyer request feature has been updated, allowing you to answer a request with a Custom Offer.
Now when you click on the “send offer” button, the pop up will include the option to send a custom offer and relate it to your Gig.
We’d love to hear your feedback here: http://forum.fiverr.com/discussion/70672/new-feature-now-you-can-send-custom-offers-in-buyer-requests#Item_1