To accomplish this, I just write Chrome extensions that post to CouchDBs (example and its Futon). Add the Couch to the permissions in the manifest to allow cross-domain XHRs.
(I arrived at this thread in search of a headless alternative to what I've been doing; having found this thread, I'm going to try Crowbar at some point.)
Also, considering the bizarre characteristics of this website, I can't help wondering whether you can exploit some security hole to get around the Flash and Javascript.