OMG, how did you find this ?
I have BDP-440 (european version of BDP-52fd) and it works !
Now it is easy:
1. to switch between CD and SACD layer - open tray
2. to switch between SACD 2-CH and SACD M-CH press STOP twice.
and after that you can use CD/SACD button on remote.
And now I have only last problem with SACD - how to get analog output + HDMI work together.