I second this feature request.
I have a slightly different use case.
I have turned off detect all file extensions, so I can exclude most of the file extensions which obsidian cannot run/preview.
However, file extensions like pdf, jpg, png, svg will still pop up in the internal links when taking notes. Presently, there is no way to turn off these file extensions.
If we can individually turn on and off the file extension detection, that will solve this problem.
Thanks.