Hey, Freescale supports SVN in CW10 now, though they may not be aware of that
Since CW10 is now eclipse based, you can install subclipse plugin into it from subversion.tigris.org or optionally subversive from eclipse.org.
That is not easy though. CW10 has a complex configuration, so simple Eclipse's update process does not work as expected. You may need to unzip the plugins manually into eclipse subfolder of the CW10 directory.
Still, CW7.2 does not support svn yet.