They can have their throughput without running a denial of service on their net connection. If you assume that they'll DOS themselves for the fun of it anyway, then I can't help you.
Backing a queue up to seconds of depth doesn't increase throughput.
Most of the bandwidth contention is at the edge, right at your DSL connection, so any battle among network connections is a battle among your own usage at any given moment.
Separately, bittorrent is not a latency-sensitive app, it's throughput sensitive, and uTP was designed for bittorent.