Add mouse/random/center plus sprites to menu option

Could I make a request to expose the menu option used in blocks like

image

in the menu creator for custom blocks

image

This comes from this discussion with @billybot21

I said that too. Well, no, I said "can we include the special menus in the option list, e.g.,

mouse-pointer
center
-
%%sprites-except-this-one

" but @jens said it'd be too hard to implement.

why