I've been looking at this, and at the moment, I can't find an option to add games to the list. I think the only way may be to pertition NVidia once the game comes out officially (unless they have plans to add it at launch).
Shadowplay was working fine for me when running ED in full screen on a 2 monitor setup.
I have however started to use the borderless gaming app to run it windowed fullscreen to allow easy tabbing out and that stops Shadowplay working (I don't have desktop mode turned on).
It won't show in the geforce menu until nvidia create a profile.
Interesting. I have been running ED as windowed but have got sick of the wide border in Windows 8.1 - what is this 'borderless gaming app' that you mention?
I saw it mentioned in another thread a few weeks ago and like you was fed up with the thick win 8.1 borders.
I got it here https://github.com/Codeusa/Borderless-Gaming