I have the issue that when I scroll with my mouse it is (way) too fast and when I scroll with my keyboard it is too slow (when I set scroll-step 1).

This is my version:

➜  toggl git:(master) ✗ zathura --version
zathura 0.4.5
girara 0.3.4 (runtime: 0.3.4)
(plugin) pdf-poppler (0.3.0) (/usr/local/Cellar/zathura/0.4.5/lib/zathura/libpdf-poppler.dylib)

And I use macOS Catalina.