Game pad/Controller options?

I recently found this one controller online, a Razer Sabertooth (http://www.razerzone.com/gaming-cont...zer-sabertooth), and I was wondering if the extra programmable buttons would even be functional/usable with FFXIV? I looked through the in game game pad/controller settings, and it appears that only specific buttons even show up. I currently have a Logitech Rumblepad and XBOX Microsoft wireless controller for my PC, however the extra programmable buttons on this Razer controller would be great to have, of course if I could even use them. Does anyone know if I could even take advantage of the extra buttons on this pad?