Image Captions in Gallery

I understand that I can go into media manager, customise an image, and change the caption from the default setting of the file name.

However, this appears to only be designed for use when inserting individual images into the article. There is no 'save' button, only insert, and therefore no way of setting the caption that is displayed when the option is used to insert them all in a gallery view. Correct? If so, is this something that will be corrected in a future release?

Thanks