Let me *try* to help you figure this out...
Yes, the number of rooms available under room only discounts are limited, however i know from booking a room for our daughter that Disney applied the RO discount, ticket discount and dining plan to a room that was NOT showing on-line as included. Not sure why, how or what led to that discount but it was significant. They wanted to stay at POP and a standard room was not included in the stay play & dine package but we ended up with the that very configuration for less than one of the AllStar resorts.
I have noticed that the most recent release of discounts when you get to the ticket page it pops up with the CDN ticket discounted prices to choose from. I priced out a dummy reservation right now including tickets & dining and the savings using the current RO discount coupled with the ticket discount is $600.00 over the same room at regular prices.
Your family is in the dining plan sweet spot (young kids & multiple character meals) but this added twist will require math, lots & lots of math (Disney math, which at times requires a degree!) I would suggest using the "compare vacation" feature on the website to see what happens right now to your desired package to get a feel for how the ticket discount impacts. You also will need a super shiny crystal ball since we don't know yet if Free Dining will happen in November & if it is,which resorts will be included.
My suggestion, based on my personal experience, (and this goes back at least 6 - 8 months now!) is to call and spell out what you want --- i didn't have any luck trying to piece it together myself on-line. Have an idea of what the package will cost, what you're willing to spend and where you would be willing to stay if your 1st choice isn't available. (not sure if you're open to CBR or not but it is often cheaper than either of the POR resorts)
Good luck, and happy planning!