With the (pending) release of firmware 4.0.0 for the E1 (thanks Martin), I am happy to announce that the Ableton Live Remote Script has been significantly improved. You can as always download it, for free.
But if you like the remote script, please consider supporting my work.
And you can also buy an extended version of the mixer preset, supporting device selection from within the mixer, triggering sessions slots, launching scenes, extended transport settings, and dynamically adjusting configuration settings.