You can save a static environment map, but if you have an animation you can’t… and that’s the case where it is more needed/useful !
I wonder if this could be done thru Python ? Maybe saving in separate images per frame and loading them into correct texture with framechange event ?
Any python guru volunteering ? 
if you can’t load a sequence of environment maps, what good does this do you?
[you’d need another python script to be able to do that]
in the python 2.34 api it doesn’t look like you have access to the image, I can’t see how to save or load one
unless getImage and setImage work for envmaps… the docs don’t say
shrug
Ouch ! 