Dean:
The Advisor I spoke to (we had DDP) on both rooms, said if I was listed in each room, I would be charged twice for the DDP. Since supposedly you need at least 24 hours to add/change/delete the DDP, I assumed what the Advisor told me was true. On all my confirmation letters, it lists the DDP as added, and the number of guests is also shown (on another line, not the DDP line).
It is good to hear that you have actually done this (I didn't, since I 'believed' the Advisor), and have had no problems, I will try it on my next visit in April. (I suppose I can always say there is an error at check-in (if they try to charge me twice), "How can I be in 2 rooms at once?"
Happy New Year.
-Tony
PS, but you can't add a name and exceed the occupation limts, I have tried this and been denied.