Add an option in Gallery to make caption a required field

The way the gallery upload works, when users upload images they tend to leave the caption empty which defaults to the image filename. This is because the submit images button is active right after upload and no further boxes are displayed unless the user manually clicks on the images. This design pretty much urges users to not fill the caption and my gallery is full of images with captions often completely nonsensical. I would like to be able to make the caption a required field.