Ctorrent - limited to 3 active torrents?

I’m playing with the built-in torrent client (cTorrent).  It appears to only allow three active torrents at a time (in any capacity - download or upload, only three total).  This is a pretty odd limitation - does anybody know if this is configurable or why the limit exists at all?  If I try to start a 4th torrent, it just gets queued until I deactivate one of the three.