I looked at the manual and had a few questions, I think I understand the rest of it well enough to get started.

Can you have 2 rescue Modes AND a stabi mode on 3 separate switches (channels?)

How do you cancel Rescue (Automatic) mode from the radio, does changing output to less than +100% on the channel disable it? In other words does it work like a momentary toggle, or is it a two position toggle?

The part that was confusing in the manual for Rescue (Automatic) was the part where it said you could set Rescue (Automatic) and then trigger it at any time as a manual command.

You can have as many Rescue modes, or any other desired features, as your Tx and Rx has available Channels. On the Stabi page pick Select By Channel. Then set them up on the Channel page. Each one on its own channel and switch.

The 100% you're referring, I believe, is more if your using the Gain option which is only needed for a lower channel count Tx.

For Resuce Automatic to work, it needs to be on a 2 postion switch. You activate it at desired height and leave it active. The unit from then will not allow the heli below set altitude. Obviously need to turn it off to land.
If programmed to a momentary switch, it will just be a bailout and not an Automatic Rescue.

Re thinking it, Spirit may actually have a limit, 8 I believe. Honestly can't remember. Know for absolute certain you can have 3 as that's what I have programmed. Rescue Auto, Rescue Acro, Stabilization Acro. Each on their own switch

Clarification on the way rescue (automatic) works:
When the channel goes from low to high, the current altitude is stored and rescue will immediately engage and hand back control after the configured duration. From then on, as long as the channel remains high, rescue will automatically engage if the set altitude is reached. As soon as the channel goes low again, automatic rescue is disabled. Turning it on again will use the current altitude as the new limit and immediately rescue once again.
Therefore if you use rescue (automatic) on a momentary switch it will function just like a normal rescue, because you disable it again when releasing.
However if you want both rescue (automatic) enabled and also be able to manually use rescue (normal), you must use seperate functions each assigned to their own channel as explained above.
E.g. stabi tab is set to "selected by channel" and on the channels page you set ch9 = "f: rescue (automatic)" and ch10 = "f: rescue (normal)", with ch9 on a 2pos switch and ch10 on a momentary switch (any free channels can be used). Make sure to check on the channel settings if anything needs to be reversed so you're absolutely sure which position is on/off.

Correct!
That's exactly how it works.

Just wanted to add that you are on the right track.
Although Rescue Auto works quite well, it is not 1000% reliable. Orientation, direction of flight, decent rate, etc all account for its effectiveness.

So it is an excellent idea to have a backup. I personally use Resuce Acro as it will apply appropriate pitch, positive or negative, to gain altitude without the delay of righting the heli.
But hey that's simply personal preference.

Cheers
And happy flying.