I installed some drivers from the Asus site, and my GL703VD now has available options for this application. My battery always shows 100% though. Not sure if this is normal with this app.
I found this elsewhere on the web and it works now on my 702vm
Open registry and browse to: HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\ASUS\ASUS Battery Health Charging
Modify dword CheckSupported from 1 to 0
Reboot your system
Now you should be able to choose any of the options within the app.
Bypassing the supported device check doesn't mean that it will really work on your device.
Sadly this seems to be true. My battery still charges. Oh well, I don't understand why ASUS wouldn't support this on all their devices. Guess there is more money in us paying to replace ours.