No you can't as has been said. I just got a quote for B&B (RO) for 5 nights in a weeks time and also a price of the 'free night' offer inc park tickets. The latter was £67 cheaper in the DLH and cheaper in all the other hotels too! Mind you that wasn't using APs, it was just a RO price without AP discount so it could be a bit cheaper.
The CS guy told me that a lot of people with APs ring up for a RO quote and end up getting a 'package' as with offers it works out cheaper. I don't there are many offers at all that you can use with AP discount.