I would like to stay a day or two at the hotel in Celebration. Can I use my DVC points? If not, how would I go about suggesting this (or any other change) to the powers that be?
I don't think Disney owns the Celebration Hotel. And I don't think there are any non-Disney Orlando options to use points. (You might be able to use II to trade into an Orlando timeshare, but I can't imagine why anyone would want to do that. And of course, the Celebration isn't a timeshare anyway - at least as far as I know).
You can call or email MS to make suggestions on places to add to the non-DVC options.
Carol's right. The Celebration Hotel has no connection with Disney. You could suggest it be added as a Concierge Collection option. This would require Disney striking a deal with this property. I'm not sure if they would be interested or not but you could make the suggestion.
I think there's really no chance of the Celebration Hotel ever becoming part of the Concierge Collection. DVC already offers so many options — DVC resorts and Disney Collection resorts — at WDW, that there wouldn't be a point.
Celebration Hotel is a nice place to visit though whether you stay there or not. A side note ... we had a nice, delicious lunch at a Cuban restaurant in Celebration last month. Another side note ... check out Gaylord Palms - WOW!