making alt tags required in posts and galleries
Design and Skin Customization
Since you can upload a lot of photos in one there is no way to put a required field into that interface. You could restrict users to only uploading one image at a time, but that would be annoying to uploaders.
You could use the alt tag as the name of the image, but its very normal to name images 1.jpg 2.jpg so they are useless alt tags.
The best way I can think of is to add a custom form field for the alt tags, make it required and then only display images that have that field filled in when you create your jrCore_list calls. so not image without an alt tag shows up.
