Lol! Banjo Heaven! That's funny, but open G chord shapes have for sure made banjo playing in G tuning easier for me. EX: I've been doing an open G version of The Beatles' Blackbird for years on guitar; I had to work out a different picking pattern for 5-string banjo, but with 1 exception the chord forms are exactly the same. I love that story about Don Everly and Keith Richards!