I just needed to publish list of some stuff that I had to do to get Heteges ROM 3.5.3 (Opie) working somewhat smoothly on the SL-5600.
To fix sound: Install opie-qss
To fix backlight: Unknown
To fix timezone: Install timezones-america
That covers it so far.
Actually, upon further review, it seems I'm still in pretty dire straights when it comes to the Z. I'll have to play with it more when I have time.