This is a request to add a "GAS" button along side the other namespace prefix buttons in they Query tab of the workbench.
Going further, the button list may soon be getting crowded. Consider here using drop down menus by organization or topic. For example:
Bigdata: BD | BDS | GAS | HINT
W3C: RDF | RDFS | OWL | SKOS | XSD
Dublin Core: DC | DCTERM | VOID
Social/Other: FOAF | SCHEMA | SIOC