Funny you should ask this...I just made my ADR of the FDP at Brown Derby for that night! I am not sure how "necessary" it is, but we love eating there, so we figured we might as well do the package again.
I will give you another tip, though...and it may affect the crowds. Fantasmic will be closed for repairs from Nov 1-10 so I think if anyone is staying that week and wants to see the show, Monday (Oct 30) may be the day they choose.