You are a braver man than I sir! ;) thanks for detailing your findings.

In the “Device Connect” option, if you first select a thermostat, you get a text display of all the settings for that thermostat. Also, what isn’t obvious, but I stumbled upon is if you click on a text value, a dialog box pops up letting you change the value (if it is changeable). I didn’t try to change any values, so can’t say for sure it actually works.

The “Go Nuts” option appears to randomly alter the position of the web elements on the page, so stuff starts tilting and drifting around on the screen. It doesn’t appear to do any actual harm – if you just refresh the page it all goes back to normal.

The “show auto-pairing dialog” option does just that – it pops up the dialog box showing a new Nest has been discovered on your local network (even though best I can tell it didn’t really re-discover one, it’s just a test of the dialog box display).

I wasn’t brave enough to try the “Trigger compressor lockout” so can’t say what that does.