The issues regarding right-clicking have to do with a switch we made to use the main branch of Wine rather than retain our own branch. We consulted players about this in May, 2019, and here’s the feedback thread.
As that thread indicates, you can enable “Secondary Click” in Trackpad Options to allow right-clicking using part of the trackpad or a special gesture (usually two fingers on the trackpad when clicking.)
Current right-click behavior in the Mac client is not a bug, but a known choice to use an unmodified Wine implementation without CCP-specific key assignments.