GP 2013 Will let you edit the Remit To address on a posted payable. Find out more at the Feature of the Day: Edit Remit To Address.
I love the idea of this feature but I makes my CFF (Certified in Financial Forensics) certification twitch. You're going to have to control this or risk having all of your payments remitted to my home address. (Let me know if this is what you really want, I can set it up today.) That's why vendor setup and vendor address setup are almost universal control points for auditing tools like Fastpath.