SSH & Torrent password

[Altin]

When I set up my Raspberry Pi with XBian I installed the Transmission bittorrent client. In logging this with the browser I had to enter my username & password (default). Afterwards I SSH'ed into XBian & changed the default 'xbian' password but I found that the Transmission client still uses the old password when I log in from a browser on another computer.

Is this a security concern at all, even though the SSH password has been changed to a much longer & stronger one? Also how would I change the Transmission password?

What I would like to do really is (assuming there is no security concern) remove the log in requirements from accessing Transmission across my home LAN. I dont have port forwarding set up (yet) on my router so it is only internal traffic that will be logging onto it.