Manufacturers: Please invent this button

As I said, write your own editor with the functionality, otherwise
it's just not going to happen. I never said anything as stupid as not
needing a caps lock button so quit trying to stuff my mouth with
words, hey pal I never even said it was a bad idea, all I said
(implied) was to use the editor with the fuctionality that you like,
write your own (Plugin/editor), or bite the bullet and live without
the invert/correct case button, maybe your button will be available
on special word processing keyboards who KNOWS...