I usually use GoodNote to take note from lecture and 80% of the time, the palm rejection did a good job. However, once in a while, the palm rejection will fail and it accepts the input from my resting fingers, which cause the unwanted zoom-in/zoom-out or movement of the page. This situation is very annoying because I have to adjust back to the original size and position of the page and keep writing. Sometimes this happen when I am still taking the note, and it really stop me from focusing the content on the lecture. I personally don't like my thoughts to be interrupted, so I would like (if possible) to add a button for "writing mode" where the whole page can be locked and no finger input will be accepted. That is, we cannot use our finger to move the position of the page or zoom-in/out; only stylus input will be accepted. Once we finish current writing, we can "unlock" the page, scroll down to another position, lock the page, and continue taking note.

I believe this will be a really good complement to current palm rejection, as it cannot work 100% accurately.