Then you want everything in the same encrypted network and the lion's share of the usage of that network to be legitimate. Although BitTorrent over TOR is currently abusive of the TOR network, it would be better to find a means of making BitTorrent tolerable to TOR (or vice-versa) than to create a separate encrypted filesharing network.
When this all gets tested in a courtroom, it is far better for an encrypted network to appear to be protecting privacy than to enable lawbreaking. The difference between the two is just how closely the type of data over the encrypted network matches the type of data sent over the unencrypted Internet. Better to encourage the use of TOR to everybody than to have one encrypted network for privacy advocates and another made 99% of pirates -- the latter service lowers the bar for legal decisions and laws to be made that can then ruin all encrypted networks in general.