Dick, I've just remembered that, three years ago, I wrote a little piece called "Kelvin Side" on which I used the "Third-Hand Universal Guitar Capo". I stopped the 5th, 4th and 3rd strings at the 2nd fret - which gave an Esus tuning. You can see the result here:

Kelvin Side

It was interesting to experiment with but, I have to say, I didn't use it again, and it's lying somewhere in my music room...