I'm pretty sure it wasn't like this, but is there any way to make shift+backspace work?

As I said, I'm pretty sure that it used to work just like backspace, but recently, I've been noticing that it does nothing. It comes in handy when you're typing out something in all-caps and you want to backspace without letting go of the shift key.

It works as expected outside of X, but doesn't seem to work anywhere in kde (I've tried browsers, yakuake/konsole, kwrite/kate, etc.).

So, does anyone know how to enable this?