I could not get email working either, and have since disabled the module. I would very much welcome a Google Docs add-on as I do not use the document features of Feng Office, but we already use Google Docs *with* Feng Office, and any integration would be awesome.
The ability for all of us to edit a spreadsheet at the same time is fantastic, and is very empowering when half of us are in Europe and Asia, and the other half are in the Americas.