(Author here) I haven't listed the specific features from Rasterbar-libtorrent but I'll make sure to do that in an upcoming update, to make it clearer. It supports DHT, PeX and LSD as well as various proxies (SOCKS4, SOCKS5, HTTP).
The first few versions actually had the vanilla Rasterbar-libtorrent peer ID and user agent, and in v0.5 users could opt-in to use PicoTorrent peer ID and user agent, and a few versions after that I made that the default.
I've been in contact with as many private trackers I could find and it's an ongoing effort to discuss with them what they require for whitelisting.
The first few versions actually had the vanilla Rasterbar-libtorrent peer ID and user agent, and in v0.5 users could opt-in to use PicoTorrent peer ID and user agent, and a few versions after that I made that the default.
I've been in contact with as many private trackers I could find and it's an ongoing effort to discuss with them what they require for whitelisting.