You would have to compile a version of the decoder which would run on the Linux/ARM platform. I think it uses floating point compuations, though I am not sure.
The source code is on this website, so if you can do that that would be great.
http://www.stud.uni-hannover.de/user/73884/audiocoder_eng.html
It would probably have to be pretty popular before empeg put the decoder in their software.
We can add AAC at any time, however there is a significant licence fee associated with it so there will need to be some demand first. My guess is that this will be the next format we support, but I doubt it'll be within the next few months.
You have to sign an NDA and work for a company to be able to get the reference AAC encoder anyway. I guess they are determined not to let it get out to the masses like mp3 did.
There would need to be a compelling reason. If ARM Ltd chose to support it then it may be easier for us to do so - as of 1.1 all of our CODEC's are bought in from ARM.