Hi George,
Right now TG2 doesn't support rendering spherical panoramas and such. However I know there are apps can take a cubic panorama, such as you'd be able to render with TG2, and convert it into a spherical panorama.
Honestly, I think it's kind of lame when renderers don't support cubic as well as spherical panoramas for environment maps, but that's another topic :-).
Regards,
Jo