I did a combo MS points/cash reservation last year. Friday & Sat with the 25% member discount and then points Sun-Thurs nights. I did have 2 reservations (made months apart) but when I checked in on Friday, they both were treated as one. I got key cards and a parking pass for the entire 7 nights. Monday was trash & towel, day 4 of the combined stay.
This year, I had a points reservation for Sunday to Thursday, I decided to add Friday night. I got a AP rate for 30% off through CRO, noted the other reservation # on both reservations. At check-in on Sunday, I only got room keys & parking permit until Friday. On Friday morning, I had to go to the front desk and get a key and parking pass for Friday night. My pass for Friday said "guest parking permit" rather than "member parking permit". I had to pay 75 cents for local calls on Friday night (rather than the 35 cent member rate). On the good side, we got full housekeeping on Friday. No problem keeping the same room.
Both times were OKW 1 bedrooms.