I don't think it matters whether you book a package or a room-only reservation. As long as you have a valid reservation number, you should be able to book ADRs with the +10 benefit.
ADRs are independent of the dining plan. If you're staying on site, you can make all your ADRs at once. Just enter a valid reservation number on line or give it to the CM when you call.
I hope you have better luck than I did with the online dining res. system. It makes you confirm your resort reservation before you can book anything past your check-in day (anything past 180 days out). It would not confirm my reservation no matter how many times I entered the number so I had to call to make my ressies. They really need to fix the system!
Our Authorized Disney Vacation Planners are here to provide personalized, expert advice, answer every question, and uncover the best discounts.
Let Dreams Unlimited Travel take care of all the details, so you can sit back, relax, and enjoy a stress-free vacation.