First, thanks for the new Mesh ACEs for Sprite, it will definitely prove useful for new visual effects!
In experimenting with setting absolute x and y mesh points, it appears that the collision polygon does not expand outside of the original bbox in the editor. I am hoping that this will be changed in the future. I do see the 'new' bbox is changed in the debug preview (to be larger than the original bbox), but the collision poly does not seem to also grow beyond the original bbox size.
Looking for feedback on the design intent (and if need I can file a bug report.)
Large bbox is setting mesh points outside original bbox, but collision poly remains around the size of the original bbox (small box picture.)