It would helpful to have a property on a document property that will allow this property to NOT be included in bookmarks. We use document properties to store detail calculations that can be used in visuals or calculated values or whatever. When this changes in development and gets deployed, any customer that applies an existing bookmark, the "old" document property will be replaced. When this occurs, the user cannot ever get the updated document property.
A switch on a document property ("Include in bookmark Y/N") would go a long way.