Description of problem:
the lack of $DESKTOPMANAGER variable in /etc/sysconfig/desktop makes 
it difficult to switch X _session_ managers. changing $DESKTOP to 
switch X _window_ managers works fine but $DESKTOPMANAGER should be 
set there as well, as it's being read later in another config file

Version-Release number of selected component (if applicable):


How reproducible:
always

Steps to Reproduce:
n/a
  
Actual results:
inability to switch X session managers easily

Expected results:
setting $DESKTOPMANAGER in /etc/sysconfig/desktop would make it easy 
to switch between X session managers.

Additional info: