Off topic, but you've just made me realise I don't always use the same finger when I type the letter R. If I were typing lower case "rg" I use middle finger for r and then index finger for g.

I'm now thinking about it too much to be able to type naturally, but I seem to use middle and index interchangeably for some keys depending on which key was just pressed / is next to be pressed.

... and I just noticed if I sometimes use different fingers from the "wrong" hand to type depending on context too! I've typed the letter Y using right-index, left-index and left-middle and left-index during the course of writing this post. I guess this is what learning to touch type without being actually taught buys you :)