We have a wedge mesh, so why not the corner variant? I wanted to shrink something I made down, but without that mesh I can’t. 
I think I’d rather just be able to shrink stuff down without limits
Can’t you just CSG a single part to itself? Or two identical parts at the same position?
I made paper with a CSG part once.
If it’s a union it has to be uniformly scaled – you can’t scale it on each individual axis.