For 1. I am unable to repro - the button works for me as long as I’m properly focused in the editor. Are you tapping it with the touchpad, or by tapping on the screen directly? The touchpad may have issues related to [Bug] Palettes require tapping option twice
For 2. Please file a separate feature request. The web API is slightly limited in terms of getting clipboard content, and will require some effort to add a native component for this functionality.
For 3. I don’t fully understand, but right now it puts the cursor in the display text position so you can type the display text right away, which is what I’d expect.