If you mean plugin support similar to what is available for Word and OpenOffice, there's not much anyone can do for it. Google Docs doesn't supply means of storing citation data in the document (that is, semantic details like the Zotero ID of an item, etc.), let alone a plugin architecture for interacting with external applications. Those apps are just not up to that particular task, unfortunately.
(If this is about a different issue [I'm not sure what is meant by a "sent to ..." button], feel free to put me straight.)
(If this is about a different issue [I'm not sure what is meant by a "sent to ..." button], feel free to put me straight.)
http://www.zotero.org/support/rtf_scan