I suggest including a few of the largest open trackers by default. You'll have a high hit rate for semi-popular torrents, and they can be faster than waiting for a cold DHT lookup in most clients. It's a minor decrease in privacy, but the BitTorrent network isn't really eavesdropping-resistant in the first place.

I wish IPFS had finished their BitTorrent support so we could use their standard gateway paths instead. The prefix https://ipfs.io/ipfs/f017b1114 should identify a hex-encoded BitTorrent infohash, letting us use a full URL like https://ipfs.io/ipfs/f017b111464d052f755e01d1c947848ad3d2218... through any IPFS gateway, which would resolve the content using a combination of IPFS' own network and BitTorrent with its DHT, but the implementation was never completed.