ImportDirectory ExtraOptions

[ReneV]

Hi,

I want to call the source code import ("Source Code Engineering"->"Import Source Directory...") from an MDG add-in. I found that this can be done with the ImportDirectory call from the Project interface.
However, not all options that can be manually selected on the "Import Source Directory" window are documented; only the "Recursively Process Subdirectories" is mentioned as specifying "recurse=1" for the argument ExtraOptions.

Is there anyone who can tell me if/how the other options can be provided in the ExtraOptions argument?
In particular I am interested in selecting (from the add-in) whether to create the package per namespace or per directory.

Thanks in advance!