FileMaker Pro Advanced 17 misses the feature for mouse wheel navigation for the navigation view in the toolbar.
For MBS FileMaker Plugin 9.1, we added MacOS support for FM.MouseWheelScriptTrigger function, so you can use it with the toolbar. If needed, you can enable/disable the feature at any time with FM.EnableMouseWheel and FM.DisableMouseWheel functions.
The Mac version of that function is a bit more clever than on Windows as we only capture the scroll wheel events while the mouse is over the right window area. Even works, if the window is background and you scroll with mouse over the window.
Coming soon for next plugin version. If you like to try today, you can email us.