Feature Req: Failsafe turns osd on about minimosd-extra HOT 3 OPEN

+1! My OSD currently goes to panel 2 when APM failsafes. This is due to lack of 
PWM input to the APM, so I guess it's interpreted as PWM == 0.

2 notes:

1. Note to Ryan: can't you set your OSD-panel-change switch to have the value 
you want, while setting failsafe? This way, when FS is triggered, the APM will 
RTL and the OSD will switch to what you want it to (I guess the panel with MAX 
info)

2. To me: Actually PWM is 1500 in my case. I just worked around this by making 
panel 2 to be the "all info" panel, and using 1 for normal flying. Upon FS, the 
PWM value of 1500 switches to panel 2

I am using all 8 channels for APM, thus I do not have a channel dedicated to go 
to certain vailue during failsafe. 

I do have RSSI going through it , so maybe an option where you configure the 
minimum rssi value before it automatically goes to panel 1.