New feature: Personalised .wav sound files to indicate when a new user has arrived.

A proposed new feature: 
Enable the host to select his|her own preferred .wav sound file to indicate when a new user has arrived in the waiting room.
The six .wav sound files offered as options are very short.  I need a longer, much louder .wav file.
I've already got exactly the .wav file I'd like to use, but I can't find any way to upload it.