Thanks for the good words and for your question.
The Media/Assistant submenu table “BULK EDIT” area is opened up by checking the box at the left of one or more items, selecting “Edit” from the “Bulk Actions dropdown at the top-left of the table and then clicking “Apply”. That opens up the bulk edit area you see in the second screen shot.
As you can see in the screen shot, the bulk edit area allows you to assign taxonomy terms to multiple items and to change a couple of fields, e.g., author and parent ID, that make sense as a common value for multiple items.
In the current MLA version, the bulk edit area does not allow you to assign a common value to item-specific fields such as title, caption, ALT text or description. These values are unique to each item, and I could not think of a good reason to include them in the bulk edit area.
You can define custom fields and add them to the bulk edit area. You can also use the IPTC/EXIF mapping rules to assign a common value to fields like the caption, or assign values only to those items that have an empty caption.
It seems dangerous to use bulk edit on standard WordPress fields like the caption or ALT text, but perhaps I am just cautious or unimaginative. If you can make a good case, I will consider adding these fields to the bulk edit area in a future release. If you have an urgent need, I can send you a test copy to play with.
Thanks again for you interest and your understanding.
