I called RSSC a couple of days ago since one of the excursions I picked is no longer a choice. The (very nice) service rep said that a new request would only add, not cancel anything already submitted. I put a comment in the form just to be extra careful, though.

He also confirmed that butler and excursion choices are not saved in the online form, so hang on to those emails and bring a printout!

We leave next week... I can't wait!!