The reason most respectable colleges don't list majors on diplomas...

[wb.john]

Those are just programs that are available at those colleges. They are not part of the degree title though. That Yale list, for example, is just a list of majors that you can get within a Bachelor of Arts or Bachelor of Science degree program.

Still, your Yale diploma will just say Bachelor of Arts or Bachelor of Science, not Bachelor of Arts/Science in Whatever you Pick From That List to Study.

There must be an element of regulation here, otherwise COSC would have separate names for their programs, right? It may not change the degree name, but there is a difference...

I don't think there's anything wrong with someone wanting a program that is officially recognized as being a program covering what they want to study.