different port number for download & streaming, or QOS

[zuurkool]

I'd love to see an an option to define a different port number for playing/streaming and for downloading (by visitors)
Alternatively I'd love to see an option build in to prioritize streaming higher than downloading.

Background (see also viewtopic.php?f=5&t=11494)
I moved places, and now my internet upload (and download) is WAY lower than it used to be. So everything must be cranked through this tiny network connection.

I managed to shape most of my common traffic through my routers QOS so my everyday internet experience doesn't become too crippled.

The problem I'm experiencing: if people are playing music and at the same time someone starts to download a track or album, the bandwidth is equally assigned to both tasks.
Because of limited bandwidth, their playback could get choppy.

If downloads could be directed through a different port I can easily prioritize the playback above downloading.
Another way to address the issue would be to have Subsonic prioritize the playback before download tasks within a given maximum (overall) bandwidth.