Shapekeys as morph targets

Blenders currenth method of handling shapekeys only allows for altered point coordinates. I believe allowing a shapekey to modifiy all vertex properties would be highly beneficial as other modeling programs like 3ds Max allow for this and some game engines can ultilise this data. The ability to have different vertex weights and UV's for shapekeys is already supported in the gltf and fbx standards, and the blender fbx io already takes at least different weights in to account