It seems like an oversight to not be able to constrain the camera panning by user specified axis’. For myself, I have a product that is very vertical in it’s overall shape. As such I would prefer that if the user zooms in, they could then pan; but only up and down. (I don’t want the product to move from the center of the scene; left to right.)
I could also see how if you were doing a first person walk-through, that you might want to constrain the camera to no move in the Z direction.
I would think this should not be all that difficult to implement. I would use the Mirror modifier options in Blender as a model for UI check box example. With the Mirror modifier, you use the check-boxes to get the desired outcome. A single checkbox labeled ‘Disable Panning’ could live at the top; and when checked, would grey out the axis options. When unchecked, it would enable the axis selections; with X, Y & Z listed as check boxes. I also think There should be limits in each direction, just as we can limit rotation and zoom distance.
.
