It's been a year since the last post and I still don't see a fix for this problem for 5.5. Sometimes the "s" triggers the action, sometimes not. At my normal typing speed for the 3 letters for validation, success is rare. If I type very slowly, SOMETIMES it actually triggers something. I don't get a failure caption, either--until I type something more.
I set On success to go to next slide, 2 attempts, and to go to next slide after last attempt. It skipped to 2 slides ahead. I reset Last attempt to continue, and IF it triggers it only goes 1 slide ahead.
Also, the spacebar is not accepted as a shortcut, which would be a good alternative for my situation as Tab or Enter or Ctrl anything would not be accurate simulation of the system. Can this be fixed or "work around"?