The reason you only see announce statistics for one tracker is that Transmission only keeps one "live" tracker at a time, as per the spirit of the multitracker spec.
Your request is part of a larger upstream enhancement ticket, http://trac.transmissionbt.com/ticket/1699 "uTorrent-style announcing: uTorrent announces to multiple trackers at the same time." -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org