If you want two rooms that have a door between them you MUST specify *connecting* rooms- not adjacent, adjoining, next to, or anything else. As I always suggest when booking, if there is something you need GUARENTEED call back until you have a confirmation in your hands that states "guarenteed x" for whatever it is. I personally had to call back 3 times for my Xmas reservation to have guarenteed non-smoking...its a bit of a pain but I can't live with the alternative.
In regards to calling the hotel, usually if you call they will definetely try to honor the request, but there are no guarentees with it- even if castmember A says "yup, I put you in connecting rooms" castmember B could change that due to demand or current guest requests, etc. Obviously Disney will always try to honor your requests as much as possible, but if its a non-negotiable item (as non-smoking is for me) get it guarenteed....be polite, explain why it must be that way, and the CMs will work with you on it whenever possible....and make sure when you get your confirmation it states GUARENTEED on it so you save yourself some frustration.
Hope this helps!