MS wil make PS arrangements for you if you so request. Not a good idea to use MS if you want something hard to get - like V & A or CRT breakfast.
I use the 800 number for WDW Travel to make PS. Try 877-939-3732 (this only works in the US) or 1-800-828-0228 and press 3 once the message starts. You might have to listen to most of the recorded message before it lets you press 3, though.
Best wishes -