How do I specify system-wide font settings? I'm using a .fonts.conf in my home directory, but this doesn't work for everything (YaST, for example).

The specific setting that I'm looking to make system-wide is:
 <match target="font" >
  <edit mode="assign" name="autohint" >
Is there any way to tell gtk apps to ignore my KDE icon theme and just use the default Gnome one instead? Firefox seems to take on a half-crystal icon theme, with icons looking as if they've come from various places.

Any help will be greatly appreciated.