Experimenting with this a little more today since there is some interest in it. Turns out the voice record feature is there once you dial a number and it does record a .amr file, but there doesn't appear to be native support for .amr; when i try to play the file back in the music app it appears to play but no sound. comparing the .so files to try to narrow down which one(s) is/are necessary.
When recording something directly with the voice recorder app, rather than with the dialer, it records in .3gp and is playable. The 'open file' menu option for the recorder doesn't seem to work however, you have to navigate to the 'voice' folder in a file explorer to play a file with the music app, annoying.
There are force closes in the dialer from com.motorola.contacts occassionally also, and swapping out the blur contacts apk hasn't solved the issue.
The empty list i mentioned before appears to be a favorites list for the smart dialer, so it does seem to work, i don't have a favorites list to verify.
I don't care much for being able to record calls, so this seems to be more trouble than it's worth for me, but this info might help someone else who's motivated to get it working.