Ask HN: Typing test for software interviews?

I've found that a simple typing speed test can reveal a lot of things that algorithms or engineering questions leave out. You find candidates with amazing resumes who top out around 50 words per minute. Then there are candidates who don't know keyboard shortcuts in an IDE (when asked to copy some code in their favorite language+IDE). This got me thinking... are there other mechanical interview questions that actually have a good deal of correlation with software engineering prowess?