Alternate stage 2 failsafe behavior defined by a switch prior to RXLOSS

Is your feature request related to a problem? Please describe

At the moment pilots can only choose failsafe stage 2 behavior prior to flight. While in flight there can be the need to change stage 2 failsafe behavior depending on the situation.

To be more precise, I need to be able to set GPS rescue as the default stage 2 failsafe behavior and flip a switch anytime before a potential RXLOSS event so that the drone lands where it is at (ignoring GPS data), and auto disarm upon landing in case of an RXLOSS event. While talking to another betaflight user they expressed their interest in being able to choose between GPS rescue and POSHOLD by flipping a switch while in flight. They kindly asked me to open this FR to develop the idea.

Describe the solution you'd like

I would like to be able to link a switch to a range on an AUX, and when in flight, with a working radio link, be free to flip the switch whenever you want. When doing so, an OSD element appears that reads "WILL LAND". You are free to flip the switch up and down at any moment and it does nothing while the link is holding up. If RXLOSS happens and the switch was on, once stage 1 failsafe ends the drone sets the throttle to a given value (configurable via CLI) and does nothing else but be in angle mode, have the throttle at that set value and wait. It does not care about GPS data. When either the drone can not self stabilize within a margin for longer then a set duration, or if an impact is detected, or after a delay, it disarms (the drone waits for either of those conditions to become true. They are not mutually exclusive). All parameters are configurable through CLI.

The idea behind this feature project is to be able to put GPS rescue on stand by if you go fly indoors, or if you are flying outdoors and want GPS rescue, but you pass through a hangar or under some trees at some point, and you can flip the switch while in flight before going in so that if RXLOSS happens while in there the drone will not try flying through a wall or a tree, then if you come out of the hangar you can flip the switch down and GPS rescue will initiate if you RXLOSS, as if noting happened.

Describe alternatives you've considered

Nothing beats what I just described up there, in my opinion.

Other information

No response