Adding devices in RME 3.5 didn't require the model to be selected.
Why does 4.0 require it. Isn't it a function of SNMP to get that info?
You can use dcrcli to do bulk imports of devices into DCR from the command line.
See the NMSROOT/ImportFiles/device_list.txt for a sample of the new CSV version 3 format. Yes, there is a sysObjectID field. It is mandantory that you fill this field in, but you can use 0.0 to set it to UNKNOWN.
Yes, all applications will update DCR once they successfully communicate with a device.
You do not need to select a device type in DCR. It is perfectly acceptable to leave this as unknown. The applications will handle setting the correct type.