Track To constraint should allow -X, -Y, -Z

I had a huge problem when doing this animation:

Basically I used the Sky Texture node for the background, but it doesn't allow rotating my skybox 180 degrees when "Sun Disc" is enabled. (I discovered we have a Vector input when it is disabled just now, when writing this and after having finished my rendering).

So, I had to flip my model upside down and render with an inverted camera. However, since I used the "Track To" constraint, I was limited to X/Y/Z up, and couldn't do -X, -Y or -Z. Thus, I had to pose the model upside down the whole time and invert it on the Video Sequencer. I'm sure there are many other cases where pointing the camera upside down is desired, so I hope this to be fixed for future releases.

Another option is blender.community/c/rightclickselect/XQKW , as we could use 180deg roll to do that, and would have the added flexibility of having even more control when tracking animations.