Transferring information back from FVTT to RW wouldn't be possible because the UUID identifier required on each individual snippet of information isn't stored within FVTT (and several snippets are merged together to form the journal entry text, so it isn't easy to rebuild snippets from FVTT).
I don't think FVTT keeps a record of when something was last updated, so it would be difficult for my module to know if something is original or modified. It could be a future (difficult) extension for my module to take two import files, try and determine the differences, and then apply only those differences to Foundry VTT - but it would be a very complicated task to do this.
I'd already created an issue in github to suggest this function, but the more I think about it, the more complex it appears. The issue is
https://github.com/farling42/fvtt-im...orks/issues/19