Seems to be an endless task re-entering the iproperties for .ipn files when in my own experience they don't differ from the .iam there exploded from.
I would like to see an option at least that can be set in the .ipn template to say "use parent .iam iproperties".
Id also like to see some backwards referencing, essentially any additional properties made in the .ipn feedback to the parent .iam.
For me, this is because I have a drawing template that takes the paper size and creates a custom iproperty "Sheet Size", that goes into the models custom iproperties. The issue here is that the .ipn when on paper doesn't reference the parent file and as a result, only the ipn gets the custom iproperty. Granted this may not be for everybody but if you were to add additional information one would expect to keep all related data consistent.