Just a little digression - Martin Carthy was playing at our folk club last night -- and he played a song with all the strings tuned to G. Very perverse! Can't remember what the song was, though...
He claimed it was a difficult tune to find a tuning for, and it seemed to solve the problem. He had a second guitar specifically for the purpose, though! Didn't risk his Fylde on it!
Nice chap - he lent me his Shubb capo for my warm-up spot, as I'd left mine at home.