When using the field option for BG, setting up a text field, the formatter options for BG gallery and random image are available, but no formatter options are provided (so no specific gallery can be selected).

Note: Whether or not this has any connection to another issue I have with BG, I'm not sure. Though both though could be Jquery / JS related. The other issue is the tag does not work for me (issue posted on this already). I doubt the two are connected, but thought I should mention it.