Dialog Preview Controls for slow operations

[ggaliens]

Dialog Preview Controls for slow operations ...

I recall some settings that would control how "responsive" a preview dialog would be as a user types in numeric values. I always though that was way to responsive and that a simple "on enter" or "on submit" or "on exit" would be enough. Not "on character changed".

There used to be a few keys I could set to control this ? Do they still exist ? I was grepping the code and could find them. I though one was auto and the other maybe 'preview'.