[richbhanover]

Yes, Don't Congest. But you can spend your life marking various kinds of traffic (many apps already do mark it, as someone down-thread mentioned), and pray that your router (and remote equipment) handles the markings properly.

Or just use SQM with Cake qdisc. It actually looks at the "sojourn time" for packets in various streams/flows of data and offers backpressure for sessions that are generating queues of data: all the other flows "go right through" without a lot of other settings.