I am looking for a program for OS X that can prevent the user from inputting the same key twice in less than X milliseconds. The set of keys for which this limitation applies to should be configurable.
Any price and license is fine.
MacOS – Avoid double keystrokes for a given set of keys on OS X
keyboardmacossoftware-recommendation
Related Solutions
On Windows, there is the Math-o-mir software. It should be able to provide all you asked for (rapid math typing, keyboard and mouse entry, basic CAS), but it requires some learning time to achieve speeds comparable to pencil-and-paper.
On my installation of 10.9 the shortcut can still be changed from System Preferences > Keyboard > Shortcuts > Keyboard > Move focus to next window:
I don't think it was ever possible to change command-tab to another shortcut though.
Best Answer
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.