FBX export should include some more data from the object like a SAP No, a description or a comment.
Also user defined properties will be a good idea.
We can use this properties to identify the object in other autodesk and foreign applications and for other cases.
Today only the InfraWorks internal object-Id is exported, all other like description or comment are ignored.
This Id is generated internal inside InfraWorks and therefor not really useable outside of InfraWorks.