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I tried that a while back and it was suggested that an ER needed to be raised to change the functionality of Event Manager. Ditto for not being able to add attachments and ditto for not being able to map to the extended parameters that event manager now offers.
One workaround for this is to create a string attribute and pass the category full name into that from Event Manager.
Then in your process have an automatic action which has the 'true' category attribute getting set via a calculation using the entry from the string.