With my Mac, I have a two-button mouse with a center wheel (something generic brand, not Mac-specific). I find that I can use the center wheel to click and drag to set a zoom rectangle in the Geography view. I haven’t tried the options in the CardView Addon.
An aftermarket mouse seems like a good idea. (despite Steve Jobs’ button phobia)
But the goal of this question is to discover info. Either to add the macOS center/middle button keyboard equivalent among the Keybindings page’s hints. Or to make certain critical features are not uniquely offered in the interface somewhere that cannot exist cross-platform.