image_attach: Default image gallery per Content Type

When creating a new Content Type, under the "Image Attach settings" fieldgroup, I would like a select list of all the Image galleries to associate with this Content Type. This would do two things:

1. When creating a new node of this Content Type and expanding the Attached Images fieldgroup, the "Existing image" select list would only be populated by Images in the specified gallery.
2. When creating a new node of this Content Type and expanding the Attached Images fieldgroup, the "Upload image" field would tag the newly uploaded file with the specified gallery taxonomy.

This should be optional. Not specifying an Image gallery for this Content Type would cause the "Existing image" select list to be populated with all Images, as it currently does.
This seems like an additional feature that would be related to the feature request titled "image_attach: image_gallery integration".