Just another data point. I booked a C+P stay for the fall tonight and applied my last 2015 DSU. Didn't have enough points (would've transferred in from UR), but agent proactively offered that I could make the reservations as a Diamond without the points.

I pressed "our you sure, I thought that was just pure point stays..", to which he assured me it could be done. I have an email confirmation of it all and verified it's all in order, so it can be done...