DMol3 and mpd.hosts

I'm trying to run Materials Studio across our cluster through the command line. Although, when executing RunDMol3.sh with a simple model it seems that it is run on a single node. The evidence is by looking at the mpd.hosts file of the job which contains only the processors of a single node. How can I provide a mpd.hosts file that contains all the node on wich to execute the job? I've tried to start manually the mpd through mpdboot with a proper mpd.hosts file but the file is overidden when RunDMol3.sh is run, which let me guess that this is not the way to go.

Thank you