Now and then my run button will act as a toggle, I can just tap it and I'm dashing. It wouldn't be such a problem but you can't move normally while it's in effect, sideways movement is weirdly limited and you get a horrible stuttering effect.

Anyone else get this or know of a fix?

Wired or Wireless Keyboard? Try a Wired one.

Do you have any keyboard software (like the stuff to make macros or disable the Windows Key in a game, that kind of thing)? If so, disable that and see what happens.

Have you remapped any keys? Try the default Map and see.

Have you disabled the Gamepad and Gamepad Rumble?

Finally, play around with the Keyboard Repeat rate, you may have to go slower or faster (not much, but it can make a difference a few milliseconds either way.