I just got the courage to update the TDPS 64-bit software on my Synology DS1511+ (Intel CPU) to version 1.0.047, but I also updated the client software to version 2.4.153 as well.
Now, I'm getting P1Keycode errors despite being able to create Spaces. I downgraded to version 2.4.117 and those errors have gone away and the new PS version seems to work much better than the previous version that I had to abandon and go back to the 'chrooted' 32-bit version.
Also, the stop-tdps and watch-tdps scripts use a ps option that is not supported by the default DSM installation's BusyBox. I needed to add the procps package via ipkg to use the option.