Hi, Jan:
I spoke to our test lead about your questions.
For the first one - this is something we've not tested or documented. Since the command takes a data source name, it seems likely to work - you may simply want to give it a try.
As to the second question, he referred me to page 20 of this document: http://www.infopathdev.com/files/folders/qrules/entry76371.aspx
Hope this helps - let us know if you need more info.