the prefs you can set in k-meleon are basically a subset of the ones found in
...\K-Meleon\defaults\pref\all.js
the ones that work vs. the ones that don't changes from time to time, and obviously many of them only apply to the mail and news aspects of mozilla, but you can find a lot of interesting things to play with in there... just try adding 'em to you prefs.js (or user.js for better maintainability) and see what happens.