You could always try setting your domain to use PHP5, register_globals is off by default under the DreamHost install of PHP5.
Changing php.ini settings is not a simple procedure, as you do not have write access to the php.ini file for your shared server.
There is a procedure described in the wiki for copying the DreamHost installed PHP executable and php.ini file to your domain and configuring things in your .htaccess file so that this local install is used. However, the wiki is currently experiencing problems, so I am unable to provide a link at the moment.
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