I posted a new version of the script with many significant enhancements. The biggest change is a switch from the expensive and slow script query interface to the persistent and fast script server interface. I also dropped the comma-separated parameters and switched to a colon-separated "bundle" for SNMP arguments, tightened up the array and variable management, added a lot more error checking, and otherwise did a complete rewrite of the script.
Due to the changes, the script and resource xml files need to be reinstalled and any data queries need to be reimported. However the existing graphs and data sources should continue to operate afterwards.
I've also moved the files to this page on my web server
so that I can more easily maintain them