I have made additions to the TelldusLive Pebble app with support for groups and sensors (temperature and humidity).
You will find the source on gihub
https://github.com/fingalo/LaTC-Remote.git
You will need Telldus live keys and preferably an account on Cloudpebble.
Import in Cloudpebble and you can build the project and download to the watch.
You will need to enter your Telldus keys on lines 63, 64 in the pebble-js-app.js source code.
Only special handling in use is, when dimming a device you need to make a long keypress on the middle button. For each long keypress the dimming will change 25%. Short keypresses will turn on / turn off devices.