There isn't really a way to do that right now. I could look into adding a width+rotation override, but that might have to be on a per-position basis or I could add a couple of selection boxes that apply to the whole ring that control the upper and lower connection points. Do you have a preference?
I'm not sure I fully understand the two options. I would have thought a singe width override that applied to the whole ring would be enough, to either extend the arc in both directions, or shrink the arc in both directions. It seems by default the arc extends to the connection point lines, so overriding with a larger width could extend it towards the outer ring, while overriding with a shorter width (or negative offset?) would bring it closer to the "connect-point-skip-2" lines. It doesn't seem like a rotation is necessary. But I'm not sure how it is implemented under the hood.
By the way, in my picture I showed two separate cases, I didn't intend to mean that both the red and blue cases could be done simultaneously. I intended to either extend the arc in both directions (like the clue line shows, just on both sides), or shorten the arc in both directions (the red X, but on both sides).