First I don't think DH would ask me that for fear that the evil eye would slice him in tiny pieces
He has watched the planning process for years. Even if we do a laid back, counter service type trip, each day has a general location plan. Even though I am going next weekend for 8 very planned days, I am already planning the trip in January.

It may appear to be an illness to others, but our trips are always great (with the random blip that occurs when we TRAVEL WITH OTHERS!)
Rest days are IMPERATIVE (according to him really) and if I were paying to staying at Beach Club, you bet I stick with my pool day plan.
Make changes to my ADRs for strangers, I don't think so. I know that sounds harsh, but you have never met them. I'm sure they are nice, but that doesn't mean you are compatible. I have done WDW with multiple family and friend groups. 50/50 shot of a good time. I would never attempt to hook up with folks I don't even know.
My maximum compromise (even though I probably wouldn't even do that

) - hand DH a printout of itinerary, he can share with them. If they want to make their own ADRs at same place or meet you at a park, fine let them take care of that. Since when are you their tour guide ?
And the two days thing - how long have they known they were going and just now say something......maybe they are just being polite to your DH in case they run into you, and really didn't want to be with you. I know if I was going the same time as a co-worker, I would wait until the last minute to tell them, so
we didn't have to make plans, but covered myself in case we cross paths.
Good luck, have a magical trip, and keep your plans
