In your case, though, you didn't know that it was a button. Now that you know, I doubt you'll press it again by accident, since there's a lot area around it to avoid the button.

> got the whatever-it-is dumped into a random terminal

I don't use that feature, but I believe it can be configured to either be an OTP or a fixed password.

Looking it up, if you or malandrew don't use it, you can disable it by deleting the OTP programming that comes in slot 1 by default:

  ykman otp delete 1