If you don't use Colemak on Linux, you can ignore this.

If you do, I have a treat for you! Have you noticed that your caps-lock to control option doesn't work if you don't have your Colemak layout as the first entry? There is a (incredibly fucking obtuse) fix!

mkdir -p ~/.xkb/rules && cat >~/xkb/rules/evdev.post <<EOF
! option = symbols
ctrl:nocaps = +ctrl(nocaps):2+ctrl(nocaps):3+ctrl(nocaps):4
EOF

This will add the option to every group.