Avoid double keystrokes for a given set of keys on OS X
I found Unshaky on GitHub (https://github.com/aahung/Unshaky)

I've been testing it for about day and so far it has been working fabulously! During a full workday I experienced a double-keystroke only once.

Please note that you have to set it up:



I put 40ms delay for each key:



I also made an exception for the Tab and Delete keys which I regularly hit repeatedly:



I am not affiliated with Unshaky in any way.