I usually don't bother with the import script but just do things manually.
I keep a text file handy to setup free vs. nonfree:
$ cat nonfree_env
export CVSROOT=:ext:hobbes1069@cvs.rpmfusion.org:/cvs/nonfree
export CVS_RSH=ssh
export CVSTREE=nonfree
export PLAGUE_CLIENT_CONFIG=~/.plague-client-rpmfusion.cfg
Then when I'm ready to do a cvs checkout:
$ source nonfree_env
$ cvs co steam
$ cd steam/devel
$ make new-sources FILES="/path/to/source"
etc...
Richard