I'm not sure if the game will support surround--may just be stereo.
HA! Funny thing is, I was looking around for a sound thread so that i could say how pleased I am with it. My sound is through the onboard 5.1 Gigabyte hardware, and it sounds really good. Although I will admit that I haven't played enough (or paid enough attention) to notice if all the sounds were coming from the right direction or not, but they seemed to.
Honestly, sound was one of the biggest things I was concerned about when I saw that this was comming from GPG. I loved the SupCom game and it's expansion, but the sound and how it interacted with my system was a mess. All gunfire and such came out of the back right, dialogue from my woofer, etc. When I fired Demigod up...weeeeeeeee! Sound all around me!
So, I guess that my point is: You're on the right track so far, and that's awesome.