Hi Michael,

Perhaps there could be a check box in Options for turning on/off toggleability of 3D button
If unchecked (default) all is as it is now, but if checked, button has 2 states 3D Perspect. & 3D Parallel.

I am totally onboard with your resistance to interface cluster. The beauty of toggling between say
Front & Back is additional utility without additional UI elements.

Anyway, I don't want to distract you from more urgent improvements.
it was just a thought.

James