Global lighting and render settings in 3D Effect panel
Please add the ability to globally change lighting, enable/disable shadows, and enable/disable ray tracing in the render settings when selecting multiple objects with a 3D effect but with different color fills, for example.

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Yes... Illustrator’s Appearance system doesn’t allow us currently to modify the mixed value, treating a tiniest difference in parameters of the core 3D effect as 'Mixed Appearances', disabling all the controls.
Astute Graphics recently published Live Effect Parameter Editor panel, and it allows to control and overwrite any value of any chosen effect in the selection, despite them having mixed values... alas, it doesn’t support 3D & Materials :(
To make this work, AI team would have to rework the way 'mixed appearances' are treated in general, not only for 3D.
Upvoted.