Hyerr, if you need to use that button at any other time, consider making it a shift modified button (e.g. make multitouch touchpad press a shift modifier, so you need to press that to make the guide button work), or if you don't use the button at all, simply unbind the Guide function from regular controls which you would have to do to perform the above anyway. There's a small chance it won't work if it's hard coded poorly by Steam, but it's worth a try anyway.
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On another, more general note, I want to point out that there could really be a better method of profile switching. The current method of switching profile within a profile is pretty broken - last time I tried it I didn't like swiping to switch, there are extremely limited options for customising how you switch, switching profile doesn't seem to completely switch profile, and when I tried to change to a different profile manually or set up a different profile switching function in a profile I had switched to (I didn't want all of my profiles to be selectable through that limited in-profile switching) the program crashed. It seems like it would have been more logical to just have it as its own standard function so people could choose how they do it, and not have them tied to another profile.
I'd also like to reiterate how much I'd like to see a sensitivity increaser to make the scale of tilt controls go from being 0 degrees to 45 degrees to being anything in between e.g. 0-1, 0-15, 0-22.5, etc., and unify how that works with the deadzone setter to make the usable scale between 5-15/etc. This same functionality would be great for the triggers for some users and games.
Aaand I'd also like to understand why I can't use a trigger as a toggle? It seems like it should be a basic supported feature.
-------MORE ON TOPIC-------
On another, more general note, I want to point out that there could really be a better method of profile switching. The current method of switching profile within a profile is pretty broken - last time I tried it I didn't like swiping to switch, there are extremely limited options for customising how you switch, switching profile doesn't seem to completely switch profile, and when I tried to change to a different profile manually or set up a different profile switching function in a profile I had switched to (I didn't want all of my profiles to be selectable through that limited in-profile switching) the program crashed. It seems like it would have been more logical to just have it as its own standard function so people could choose how they do it, and not have them tied to another profile.
I'd also like to reiterate how much I'd like to see a sensitivity increaser to make the scale of tilt controls go from being 0 degrees to 45 degrees to being anything in between e.g. 0-1, 0-15, 0-22.5, etc., and unify how that works with the deadzone setter to make the usable scale between 5-15/etc. This same functionality would be great for the triggers for some users and games.
Aaand I'd also like to understand why I can't use a trigger as a toggle? It seems like it should be a basic supported feature.