Phex doesn't read out torrents, as (afaik) they lack a sha1-hash, which is crucial to start a file-specific search in Gnutella.
Different from BitTorrent, Gnutella is a network with an efficient internal search-mechanism, so you don't open a torrent, but simply start a search for the content you want, instead (and if someone shares it, you will likely find it and get to download it).
If you need torrent-support, why not use two programs, Phex for Gnutella, another one for torrents?
Integrating torrents into Phex would be a hell of a lot of work - work which can be better used for making the Gnutella network more efficient still, and there are some really great bittorrent-programs out there already.
A work in progress to create a torrent alternative for gnutella can be found at
http://www.freebase.be/ , where you can find magnet-links for popular free windows software.
Also there are
magma-lists, with which you can also serve content just like in a torrent file, but they aren't that widespread yet (at this time, Phex can read and create them).