The Report.SNMP.System summary activity should be able to be run against any device that provides SNMP MIB-2 system information.
It should be able to be run against devices not otherwise supported by CatTools. You can add a new device and call it any device type as CatTools does not use device specific logic for this activity. The only details CatTools uses are the IP address to find the device and the SNMP read community string to access the device.