... the "possibility" is self-contradictory to the point of being oxymoronic. ... The words have meanings, as as you yourself acknowledge, this violates them, to the point of bleaching all meaning or indeed sense out of them.
This is true if you believe that skepticism is and only can be a variety of doubt. But I don't think that's necessarily the case. A proposition may exist that we consider to be true, but to which we apply skepticism out of a sense of self-honesty. We allow ourselves to imagine that the proposition might be false, even though we harbor the conviction that it is true. By examining the proposition, we are not engaged in doubt, but in skepticism. Lo and behold, we might be surprised to learn that we were wrong.
You are proposing a model of skepticism that does not include meaningful inquiry about those propositions that we do not doubt.
It's not a question of "pressure dial," but of evidence.
The "pressure dial" and the other so-called "dials" that I discussed in the OP represent decisions that we make consciously or unconsciously when we practice skepticism. Because we are human beings, there will always be the question of struggling with and acknowledging our beliefs as we examine ourselves and the world around us. There will always be the question of a "pressure dial," whether or not we choose to recognize it.
To willfully ignore evidence and to withhold warranted (dis)belief is not open-mindedness. ... Should I "neither believe nor disbelieve" that Italy won the World Cup? Why should I consider this still to be questionable?
Not everything is quite that straight-forward. The most important questions are not as black-and-white as, "Who won the World Cup?". If the universe were that simple, we wouldn't be having this discussion, or any discussion in this forum. It would be obvious to everyone what is true and what is not true. We wouldn't even have to think. All we'd have to do is look at the unambiguous evidence, and we'd have perfect knowledge of reality.
That's not the way it is. Reasonable, intelligent people can disagree about what evidence shows. There are times when we will be mistaken, when those propositions that we do not doubt are in fact wrong. We all make mistakes.
Thus is may be useful to talk about the possibility of skepticism in the absence of doubt. This does not render the word "skepticism" meaningless. Rather, it gives us an opportunity to explore more deeply what we mean when we use this word.
So we have two choices: 1) We can settle on an absolutist definition of the word "skepticism" that makes it inseparable from doubt under any circumstance; or 2) We can acknowledge that when it comes to terms like "skepticism," common usage might not capture all the nuances of what we really mean by the word.
If I understand you correctly, you reject the possibility of (2) and affirm (1) as the only reasonable choice. That may be your position, my friend, but I am skeptical.