[support] question about table location_instance

[Scott]

The location table location_instance, as far as I've determined,
supports either a location associated with a user
(location_instance.uid) or with a node (location_instance.nid and vid).
I would like to have a location associated with both.  I have a module
that does this and it seems to work okay for my purposes.  I am
wondering what problems I might encounter doing this.