can linuxmce control light dimmers?
yes. zwave, x10, eib, etc.
Please read the following page
http://wiki.linuxmce.com/index.php/What_can_I_do_with_LinuxMCE%3F
especially,
http://wiki.linuxmce.com/index.php/Control_lights/climate_using_scenarios
and
http://wiki.linuxmce.com/index.php/Control_lights_or_climate_with_a_floorplan