Any chance of a longer sensor cable? If you don't supply one, is it straight tip, ring, ring, ring? Out of curiousity, is there any means of attaching more than one sensor?
We've got 10' cables coming in a few weeks. Our cables are a little fancy - we had them custom-made with shielding connected to ground for extra signal reliability. If you can find a TRRS male-to-male cable, it should work, but we can't guarantee it'll be reliable over longer distances.
And no, one external sensor at a time for Twine right now. We may make a splitter in the future, depending on resources.