Good question, and your hunch serves you well. The import is currently a one-way road.
We are certainly receptive to the idea of a round trip back to PCGen though. I'll speak with their devs about this for a future release.
In the meantime, the PCGen importer is wrapping up - expect a new version of it soon. We are still on track to have it done (and v3.2 out the door) ahead of Origins at the end of the month.