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Thanks! It seems the default keys are already pretty good although small improvements can be done. I'll definitely bind zooming to the scroll wheel but I'm not so sure about the middle click. It's easy to accidentally scroll a bit while middle clicking and I don't even know how to middle click on a laptop touchpad!

To prevent accidentally opening the camera menu pop-up, maybe an option to require double clicking instead of a single click?

Hmm, double clicking as in double right clicking ? that would be harder to discover unless it's explained somewhere; as double right clicking is not very common in PC usage. If I understood wrong and you meant moving it to left click and using double click activation that could work to reduce its accidental activation; it might require some time to get used to no zoom there. But hard to say how it would work when more functions are assigned in the future.

Another option is binding it to a key like "~" given that the top row is camera things; and/or transforming it to a radial/pie selector which pops up when key is hold.

Yes, double right clicking, but only as an additional option. The current setup would be the default. With zooming on the scroll wheel the left click zoom could be changed to work only when the button is held down. This would also help with misclicks in the future when clickable cab controls are in place.