if you run the Xorg -configure option it will create xorg.conf.new
if you want all users (or the default) xorg/icewm setting to change you'll have to replace
/etc/X11/xorg.conf (which is probably empty, size=0)
with the new one...
Additionally,
Section "InputDevice" Identifier "Keyboard0" Driver "kbd" Option "XkbLayout" "pc105" Option "XkbLayout" "gb" EndSection
Option "XkbLayout" "us, se" Option "XkbOptions" "grp:caps_toggle"
Option "XkbModel" "microsoftmult"