I have just started work on a Tellstick plug-in for Plex to control your devices from within Plex.
Currently it supports listing your devices (gets data from tdtool) and switching them on/off by pressing enter in the list view:

You can of course add the application to your Favorites

And there is a setting to tell the app where tdtool is located

Hopefully I'll have something people can download and try themselves this weekend! If you have feature suggestions, let me know!