Recently I added

[output]
notify=1
[hijack]
suppress_notify=1
[serial]
car_rate=115200

to my player's config.ini. I did this by using ftp to download the config.ini from empeg/var to a local folder and then I used the windows notepad to edit the config.ini.
The "Restore Visuals" function seems to work, at least in DC/Car mode, but everytime the empeg boots up, i get the "hijack config error". (Btw.: my config.ini is 793 Bytes).
I restored to the original config.ini which i've made a backup of, and used emplode to edit the config.ini (after applying the reg-hack, of course). This time, there was no "Hijack config error". I'm sure i've made no typing mistakes during my first attempt, i still have the modified .ini on my local drive.
One thing i noticed was the format of the config.ini.
It looked like this:

[hush]hushpercent=20[display]visual_names=1
and so on.

I changed that into

[hush]
hushpercent=20
[display]
visual_names=1

maybe it's a problem with the char set? I've got a german windows install.