There are possible compatibility concerns about renaming the
KDE desktop files to add the kde- prefix; they are used 
frequently to look up different services using
KService::serviceByDesktopName 
(often via KApplication::startServiceByDesktopName)

The problem is shown by the size of the .dtfix patch that was needed
for kdebase, though, admittedly, most of that is the trivial case
of kcmshell desktop files.

A bit of additional technology would make the renames invisible
to applicaitons using serviceByDesktopName:

the addition of the kde- prefix is done by the desktop-file-install tool.      
            
What it should do, is, at the same time add a X-RedHat-DesktopName             
                                                                               
                                             field with the original name.

Then, make kio/kio/kservice.c:KService::init()                              
use this, if set, to set m_strDesktopEntryName.