I wrote a PHP script that leverages the AirControl API.
It is HTML5 and uses the IOS web-kit so it looks like a native app. Once installed you can add it to the home screen with its associated icon:
[[wysiwyg_imageupload:330:height=93,width=96]]
Once launched it displays a modified ATV remote image:
[[wysiwyg_imageupload:331:height=164,width=43]]
each button functions as expected via the AirControl API (support page) and includes the ‘npx’ function for ‘Now Playing’
[[wysiwyg_imageupload:332:height=96,width=183]]
I didn’t see where I can post a file in the forum so let me know if you want it and the image files.
-mike