The angle for circular scrolling is shown to be in degrees in the control module (and is written as-is to the synclient), however, the mouse-over text says it's in radians. This results in virtually non-working circular scrolling when I enter the values I was used to from kde4. E.g. I had 5.76° there (quite sensitive), but when I set this in plasma 5, I had to make a lot of turns for the scrolling to move a tiny bit. So essentially, the conversion between degree and radian is missing. Reproducible: Always
I just found that this is a duplicate of https://bugs.kde.org/show_bug.cgi?id=359460. I could not work around this by putting a script which calls synclient VertScrollDelta=106 into .config/plasma-workspace/env. I would be really glad if this could be fixed quickly as it makes two-finger and circular scrolling almost unusable/unconfigurable.
I figured out a workaround now. I put a setscroll.desktop file into ~/.config/autostart which calls a script which executes synclient VertScrollDelta=106 synclient HorizScrollDelta=106
If the fix for bug 359460 did not fix this issue, please add a comment. *** This bug has been marked as a duplicate of bug 359460 ***