Smart Mode - Biggest size option

In 4K Video Downloader, could you add the option in Smart Mode to download the file with the biggest filesize (regardless if it's MKV or MP4). Very often, people want just that - the best quality. If you load an entire channel and pick, for example, MP4 - Original, chances are a lot of 4K videos that are only MKV will be downloaded in 720p MP4 and not 4K MKV. Thanks!