A comprehensive description: To add a 3D Shape with a single face and that always face the camera.
It solves a real problem / It covers alternatives and workarounds: The existing way of making 3D Billboards with other shapes is hacky, it adds a number of "every tick" + angle complexities that are far from clean.
Also, due to the rotate angle limitation of 3d shapes, the billboards are never quite right (specially for "angled top down" and isometric views).
This would drastically reduce the amount of code/events needed to make 2.5D / 3D games and it would make it possible to make "angled top down" and isometric games (which are currently impossible to make with the 3d shapes).
I tried using prisms and wedges to make angled billboards for a angled top down game but it was a disaster: Due to Z size differences+transparency+distance draw order, it caused all sorts of visual glitches)