I'd like to try and replicate the Maya BatchRender job, but run it directly.
Could you log into the remote worker as the user who ran the job (the proxy user if your site is configured to run in proxy mode), then run the following directly from the command-line?
"/Applications/Autodesk/maya2009/Maya.app/Contents/bin/Render" -s 1 -e 1 -b 1 -renderer "vray" -im "testVray" -of ".png" -proj "//mfserver/Jobs/0000 Test Project 2/Scenes/3d/" -rd "//mfserver/Jobs/0000 Test Project 2/Assets/3d Renders" "//mfserver/Jobs/0000 Test Project 2/Scenes/3d/testVray.mb"