Configuring the cluster mode

Hello all,
I've got trouble configuring properly the cluster solver configuration. I want to run a given mph in parallel on a Linux cluster (I'm using qsub on the server side). I don't want to have to use command-line mode, so the new GUI mode of the version 4 looks fine. However I don't manage to get the thing done, I think I'm missing a parameter or st.
I've not found some kind of tutorial or guide, and I find the user's guide explanations most evasive about this, so I was wondering if anyone is already using COMSOL with a linux cluster and could help me understand how to configure it better.

Thanks in advance

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Y.