Hello Minh-Tam,
At the University of New England we already have this feature. We have been using it for a couple of years with success. The settings for ours are set at the same location on the assignment settings page, but rather than having an option to turn restrictions on or off we an option for ‘Any files’ as well PDF, etc.
Another feature not listed here is displaying the allowed file types to students. Rather than rely on teaching staff to manually add this to the assignment description the one we use adds another item to the submission status table, with the text “The following file types are allowed”.
Our plugin could do some minor work, so I am interested to see where this goes. I’m happy to talk further with you Minh-Tam about ours.