What is your suggestion?

Add a way to "mirror" entities. When an entity is mirrored, its model would be mirrored along X axis, making it look like you're watching at it through a mirror, and when a player is mirrored, their model, left and right movements and rotations and a camera view would be inverted, making it so they would see as if the whole world would be mirrored.

Negative value scales doesn't have any purpose right now, so I think it would be nice to replace current negative value scale behavior with "mirroring".

I like this idea