Well, I can tell you that in the match I played where my opponent was overruled neither of us had requested the presence of the roving umpire.
She was *roving.*
[edit: Also, note this: "Avoid staying on one court and officiate all courts uniformly."
Doesn't this suggest the roving umpire is to rove, and when they are roving they are supposed to be watching?]
They are to be available to help settle disputes whether it is about the score or a ruling.
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