X-displays:(same as debian, using xmodmap).

Console(non X environments):

  $ cd /etc/conf.d/
  $ sudo emacs keymaps # use whatever editor you prefer
  $ # find the line that reads KEYMAP="", and change it to KEYMAP="-personalized" ("" is not a litteral, its a value, for me it was KEYMAP="us", or so i think and i made it KEYMAP="us-personalized"),  Save the file and exit $EDITOR.
  $ cd /usr/share/keymaps
  $ find . -name '.map.gz' -type f # use "" value from the last command
  $ # observe the directory holding that file the last command found, and cd to it
  $ cd  # for me,  was i386/qwerty
  $ sudo cp .map.gz -personalized.map.gz
  $ sudo emacs -personalized.map.gz # if you are using some other editor(not emacs), it may not have capability to edit gzip files, so follow the usual procedure of gunzip'ing it first, editing it, and then gzip'ing it again. (cat -personalized.map.gz | gunzip > /tmp/my_map && $EDITOR /tmp/my_map && cat /tmp/my_map | gzip > /tmp/my_map.gz && sudo cp /tmp/my_map.gz ./-personalized.map.gz)
  $ # find the line that reads 'keycode 58 = Caps_Lock', change it to 'keycode 58 = Control' and find the one thats 'keycode 97 = Control', change it to 'keycode 97 = Caps_Lock'
  $ # save the file, and you are done, on the next bootup, your non X session should have Right Control key as CapsLock and CapsLock key as Control.

x11vnc -create -env FD_PROG=/full/path/to/blackbox

The session will be created the first time the viewer connects. Report back how it goes if you try it.

You may be able to solve the key modifiers problem with the xmodmap settings described here:

http://www.karlrunge.com/x11vnc/faq.html#faq-xvfb

Note that the x11vnc -create option that starts up Xvfb can probably also be made to start up blackbox as the wm. Ask if you are interested. The -create option does the xmodmap for the missing modifiers as well.