You can support message signing, secure login and more.

that would appear to have answered my question. thanks.

I guess this is planned and is being worked on. You should watch this for more details to appear:
http://doc.satoshilabs.com/slips/slip-0013.html

Edit: and it works: https://twitter.com/GreenAddress/status/479939415088062464
Edit2: if you are wondering why Trezor does not have "bit" nor "coin" nor "wallet" in its name then this might be the reason.