Hi!
One of the things Reasonator does not do is provide information on qualifiers. I am interested particularly in Q2354820 http://www.wikidata.org/wiki/Q2354820 and where it is used.
If you mean usage as a qualifier's value, this would probably work:
SELECT * WHERE { ?st ?pred wd:Q2354820 . ?p wikibase:qualifier ?pred . } LIMIT 10
but no result is produced, so I assume Q2354820 is not used as a qualifier value (unless I'm missing something).