Devo 10 radio timer

I know it is here somewhere on the forum but I have been searching for over an hour now. What I want to do is set a timer that will sound if my radio is left on too long without any stick input. How do I do this? Help me please.

I see nothing under Transmitter config - all I have is Pwrdwn alert. Is this something I have to write to the INI file? Sorry if this seems like a stupid question - have a 9x with er9x but am new to deviation.

MakDaddy wrote: I see nothing under Transmitter config - all I have is Pwrdwn alert. Is this something I have to write to the INI file? Sorry if this seems like a stupid question - have a 9x with er9x but am new to deviation.

That can be found in the nightlies.

Thank you so much for the quick response. I will try a nightly release.

Update:
Night release does have this option - works great!