This is my own hack of the standard Rush XSI UI. I only added a few parameters to expose some more controls, reason being I want the control being outside XSI (no need to launch XSI to change render parameters).
It needs some modification in order to get it to work for your system (edit the perl file in notepad).

This requires tool requires:

Rush Render 102.42 (not a freeware manager) http://seriss.com/rush/
ActivePerl http://www.activestate.com/Products/Download/Download.plex?id=ActivePerl
Softimage|XSI 5.0

All the software above is installed using standard installation according to the docs that comes with the software.

DISCLAIMER:
I take no responsibility for any damaged pixels or lost renders. Nor do I take any responsibility for any ugly images that is created with this script.
This is "as it is" donated script, and should be considered as "under development"