There is currently the option to do “Volume Down (Small Step)” & “Volume Up (Small Step)” which does quarter increments, and assume via the option+shift method.
Brightness also has this ability to go in quarter increments but is not implemented into BTT. Any chance of adding this in?
I checked the release notes for the alpha versions and there’s no mention of this in there.
BTT version: 2.512 (latest stable)
MacBook Pro (15-inch, 2016)
macOS High Sierra Version 10.13.5 (17F77) (latest stable)