You guys, this is amazing. It's SO much better than the old
gform_post_data filters I had in place.
Alas, I've had to keep a couple of those filters on one site, because it requires a few plain text inputs (comma separated) for non-hierarchical taxonomies. In this instance, we don't want people selecting from a predetermined list; they really do need to be able to enter whatever they feel like.
If you could add that in a future version, I'd dance with joy. And delete a lot of crufty code. ;)