I think an option for the transcoding/re-encoding of files would be nice. MP3 is supported everywhere, but browsers nowadays also support all kind of other formats (even losless).
You can check it here:
This would make it possible to make a whitelist e.g. which files don't need to be transcoded. *.flac;*.wav;*.ogg and so on
Thanks for the request. We have some ideas on how to improve transcoding in general which we are looking at. We will take your things into consideration when looking at this more in detail.