I've had a look around the Rockbox site, and I can't see the answer to
this ...

When I grab a new daily build, which file(s) shouldn't I overwrite to
preserve my current options/settings on the player?

Last time I foolishly overwrote everything and has to manually
reconfigure the player. *blush*

Chisel

-- 
Chisel Wright
e: chisel_at_herlpacker.co.uk
w: http://www.herlpacker.co.uk/
  I may be a pretty sad person, but I don't make jokes in base 13.