At the moment "Disable tracking for" disables tracking the role which is selected. This seems straight forward but is not, what most want.
Right now you can only disable a single role and note more.
It's makes much more sense if the selected role and higher roles are disabled. E.g. if I don't want internal staff to be not tracked it most likely is admins and editors. Maybe it's also authors and contributors.
Essentially most people want only those people be tracked who don't work for this blog or site.
Do you intend to change the disabling behavior?