You know, FMOD does do all those things. I don't know if it's in the version online, and I don't know if people notice it, but the Technoventure SGDK2 sample game does pan some sounds from left to right based on where on the screen they are.
The FMOD license says FMOD is free if the product is free. Are you concerned that people may want to be able to use SGDK2 to create commercial games and will then have to pay for FMOD? I wonder if it would fly to license FMOD for SGDK2 itself as a hobbyist/shareware author ($100) and then all the games created with it could include it. Probably not, but maybe .