Below is a table of properties callable by system.device.addDevice.
Note that the Description and Enabled properties may not be configured with this function, although a device connection could be disabled with a call to system.device.setDeviceEnabled() after creating the connection.
I use the description field to copy the IP address into so that I can quickly see what all device IP addresses are configured as. Otherwise it's an absolute PITA, especially with >90 devices.
I need to add 20 new devices and I really don't want to have to set these descriptions up manually