abc Well, glob is a kind of standard and it is just not working like that. There is not so much you can do about it. It is also not a limitation of the CMS. Glob works on a lower level and is the normal syntax to select files on all kind of CLIs — Unix and Windows.
I think the best would really that editors follow some naming conventions. That is also part of the editor’s work.
The only option I can think of would be to move all images that should be excluded to another page or the shared folder.