WP8 keyboard tip

Hey, I just serendipitously came across a 'hidden' function of the shift key. If you highlight a word and press the shift key, it'll cycle the word through three different cases:

lowercase→ Sentence case→ UPPERCASE

Has this always been a function, or was it added with the 8.1 keyboard? I couldn't find anything about it on the How-To section of windowsphone.com. I guess there's the possibility that this is just a well known feature of phone keyboards that nobody talks about, haha. In any case I think it's cool that it exists.

On another note, I wouldn't mind an added function to capitalise each word...