Nope. Partial File Sharing is not BitTorrent.
I looked up what partial file sharing means and it was what I thought it meant -- sharing of partially downloaded files. BitTorrent is different. If two clients try to download the same file from a server, the server tells the clients to share files amongst each other instead, thus alleviating the load on the server. In LimeWire, if this feature was implemented, it could prevent multiple users from leaching one popular file from a LW user. Such an anti-leech feature would alleviate traffic on clients that share in-demand files.

Switch words "client" and "server" with the made-up p2p word "servent" wherever you please.