I started looking into rooting/changing the launcher on my watch to Nova for this... BUT.. other then showing off, I can't see the real life use for the keyboard on the watch yet.
The main use I can see is for quick SMS, especially when in the car (at a red light) and I need to tap out the 3-5 word page.
Other then that - it would be better to just use the phone.
Will be keeping an eye on the sms thread, but not seeing much yet. Crossing fingers!