There is a setting for this in Unity8 now. It's the second (unnamed) scrollbar under: System Settings > Mouse & Touchpad > Mouse
However there are two bugs related to that scroll bar: 1. It's not yet labelled (bug 1569227) 2. It doesn't go high enough (missing fix: https://code.launchpad.net/~vanvugt/ubuntu-system-settings/fix-1607240/+merge/301606)
There is a setting for this in Unity8 now. It's the second (unnamed) scrollbar under:
System Settings > Mouse & Touchpad > Mouse
However there are two bugs related to that scroll bar: /code.launchpad .net/~vanvugt/ ubuntu- system- settings/ fix-1607240/ +merge/ 301606)
1. It's not yet labelled (bug 1569227)
2. It doesn't go high enough (missing fix: https:/