mp4 in audio category instead of video

In "Sorting & organizing" under "Type-based rules" in the default category "Video" the .mp4 file extension is missing but it is present in "Audio".

I understand that the mp4 container can also be used for audio only but more than 99,9% of all the mp4 container files i dealt with used the extension m4a for that.

mp4 should definitely be in the video section, not audio. (As someone already suggested back in February 2015(!!!))
also flv is missing but by the time stardock actually starts caring about their customers flash technology will be gone completely anyway and nobody uses fences anymore because we would have to re-buy fences for the 100th time because a new version came out that does exactly the same thing as the one before.

At least we can edit the file extensions for the categories.