Hi,
just a quick suggestion,
since we're able to have more than one movie assigned to one number, it would be nice if we were able to change the borrower of that number, hence changing the borrower of all movies assigned to that number, directly from the catalog, like selecting all movies assigned to a number and editing the borrower field.
I have a number assigned to every disc, a disc might contain multiple movies, so if I lend disc nº1 all movies had to be lent, not just one.