In the ONLYOFFICE PDF editor/reader, scrolling is currently quite limited compared to other readers. I’d like to suggest a set of improvements that would greatly enhance navigation, especially in PDFs, but could also be useful in text and spreadsheet editors:

Middle-click autoscroll:
Clicking the mouse wheel should activate auto-scroll (with an anchor), letting the user move smoothly up/down/left/right by moving the mouse. This is standard in most PDF readers (browsers, Adobe Acrobat, etc.).

Adjustable scroll speed:
Add an option in settings to customize how sensitive/fast normal scrolling behaves (with the mouse wheel or trackpad). Long documents benefit a lot from this control, avoiding overshoot or endless scrolling.

Page-by-page scroll mode:
Especially for PDFs, it would be very useful to disable continuous scrolling and instead view one page per screen, where the scroll action jumps directly to the next/previous page. Acrobat and other readers support this mode, and it’s excellent for focused reading.

While these features are particularly important for the PDF editor, having them available across all ONLYOFFICE editors (Docs, Sheets, Presentations) would improve the overall user experience and consistency.