Starting with later versions of AccuRev (about 4.8 IIRC) it is possible to check out sources via the pop command, that is you can just execute:
accurev pop -O -R -v "Streamname" -L localDirectory \.\
to get the sources from a Stream.
Have the plugin developers already looked into adding this option to the plugin? (I think this could replace the reftree solution.)
As an aside question: is it possible to customize the workspace name the plugin uses for checkout? (If I want to use a Workspace for checkout.)