Possibly the FAQ needs updating regarding How do I edit the 'config.ini' file on the player? now 2.0b13 has arrived?

In the FAQ it explains you should add a New DWORD value named allow_edit_config with a value of 1 to:
HKEY_CURRENT_USER
Software
SONICblue
emplode
2.0
Settings

With 2.0b13 you also now have to create the key Settings below 2.0 before you create the key allow_edit_config beneath it. This is not to be confused with the new key at a higher level named Settings - creating the sub-key allow_edit_config there doesn't work.