It seems ideally that Wikibase needs a few underpinnings in place before extending the API in further directions.
One would be a way to mark a Property as being "disambiguating", to use a Freebase parlance.
The property that has a label of "official website url" is an important disambiguating property.
Unfortunately, there does not seem to be that marker that tells me if certain properties are useful to disambiguate between similar entities.
I would like to see Wikibase extended so that individual Properties could be marked as being "disambiguating" or "rather important".
Futhermore, the wbgetclaims action should also be able to use this new proposed parameter to return only disambiguating properties (instead of the default all properties) like so:
Thoughts ?