The interface is there for creating post meta/custom fields and it will currently add them to posts.
As part of premium services I'm writing the code for updating features now. Updating in this plugin is considered advanced and only in the full edition. Users can select specific post meta to be updated, rather than updating all meta values for the sake of it which takes more processing.
Not begun to write the code to handle images. Free edition will allow featured images to be set. The plan is to have options for changing dimensions also and import images to the WordPress media gallery.
Thank you for your interest. The plugin is very new but being worked on everyday so there will be a lot of changes over the next few weeks.