A controller that can import/export t3d files would be very nice. I already wrote the attached controller that can handle imports (works well for me) - the export seems a little harder to do. Use the controller like this:
typo3/cli_dispatch.phpsh t3deploy impexp import [OPTIONS] FILE [OPTIONS] All public vars of class tx_impexp (arrays can be passed as commaseparated list) and additionaly: -v [--verbose] Increase verbosity (will show all actions performed and not just errors, which is default) -o [--override] Will truncate ALL tables that are contained in the import. --pid ID The page ID in which to import the data -u [--user] USER A USER name which you want to execute the database transactions (e.g. some admin) FILE A .t3d or .xml file created by the impexp module
I can help out integrating it when you add me to the project.