First thing I looked for was optional scroll bars. It should be selectable in settings, for efficiency, ease of use, and not having to use 2 hands (could be used with a pen, without needing extra hand or 2 fingers).

or just 2 buttons on the menu bar there is enough space.

I don't like using fingers to scroll accidentally draws/rezises the screen and gets sweat on the screen. At least make the button appear if there is enough space in horizontal mode there is plenty of space.

2-finger scrolling can be tricky. A button that activates single finger scrolling when touched that automatically deactivates shortly after use would make writing/editing much more a fluid experience.

It's very annoying when it comes to pdf scrolling with two fingers

I meant zoom lock above.. sorry for the mistake :)