SP on off days

[New York Mets]

I wonder if it is possible to manually move SP which pitch on an off day to the next day (if formally asked for by the respecing team). This would give every team a chance to get a little more out of their SP by reducing starts that don´t count.

[Colorado Rockies]

By off day do you mean days we do not have games? I think that is only a couple of days during the season.