Ability to change text, to use a marker in pdf's, to draw and to customize.
The pdf function is just too bland as it is, it would be great to add pencils, erase information and to highlight it.

Also the AI prompts are still, most of the time, useless, but it would not be the case, if were customizable, and maybe the posibility to add a keyboard shortcut to toggle the prompts after selecting text, not everytime when selected.