Hi meow;
Please add the following requested features to the plugin:
1. add Option to easily add as many extra thumbnail sizes manually to plugin and wordpress
2. add Option to remove not-used-anymore thumbnails
3. add Option Remove metadata for missing images and thumbnails (Clean old metadata not defined in system sizes. Useful after removing plugins / themes with old definitions)
4. add Option to select the thumbnail size for featured and non-featured images
5. Interval selection (last day, week, month, all) for the thumbs that will be regenerated
6. Delete thumbnails and metadata not selected in the settings
7. add Option If the main image does not exist, removes this image, thumbnails and metadata
Thank you very much for the wonderful plugin