What are PCM SACDs? I think you are confusing with either of the following:
1. SACD has a CD layer
OR
2. Original recording was in PCM that was converted to DSD for SACD.
In either case the player will ALWAYS play the SACD layer, when a SACD is inserted. But, say, if you inserted a CD or a Bluray, then the player will automatically recognize the PCM data, since DSD data was not detected, and play appropriately. You don't have to manually do anything.
I have defaulted my SACD to stereo and the player does fine.
Enjoy your player and most importantly, the music!