Skyboxes only use Z movement?

[Blaze The Cat]

I found it very, very strange that Skyboxes do not follow the player on the X and Y co-ordinates. Not only does it not feel natural, but it almost gave me motion sickness when I first tried this:

 

[Monster Iestyn]

This is not a bug, you need to add a second Skybox Viewpoint some place in-map with the "Object Special" flag checked. This turns it into the Skybox's center point, from which it can follow the player along the X/Y axes.

As a future note it helps to do your research fully before concluding that a feature is nonexistent, we have at least two wiki articles that tell you stuff about Skyboxes (here and here btw) which do indeed mention that "Object Special" does stuff.