For those of us rocking with the Note 3 features on custom ROMs:
Perhaps there are times when you wanna use Air Command but one of your hands is preoccupied and you can't unsheathe the S Pen (never try using your teeth and end up discovering the S Pen actually tastes like a thermometer).
The solution lies in the GMD Air Command app which allows you to place an Air Command icon on your Homescreen. Tap the icon or gesture-set the app and out pops Air Command. Look ma, no S Pen.
Go to the Play Store on your Note 2 and you either can't find the app or you will get that 'Not compatible with your device' message thrown in your face (unless you happen to have a certain Xposed module installed). But here's the XDA link to the downloadable APK:http://forum.xda-developers.com/showthread.php?t=2610770
Tested on my DN3 and Tigra ROM and it's working without a hitch (except for Scrapbooker which can't function with fingers by default). Oughta work too on other ROMs with Air Command.
Don't forget you can summon Pen Window via this way too using just your finger. Give the middle one to Apple.