That's really neat. For several years I kept a regular-scale guitar around in what Robert Fripp refers to as New Standard Guitar Tuning - CGDAEG. There are obviously a lot of ways to open things up, but the basic question of how to play great melodies remains... I have two steel guitar tunings to contend with (one ten-string), fretless bass, open-tuned and standard-tuned guitars in six and seven-string versions. And an electric mandolin, tuned of course in fifths. I think a variety of tunings are good for your brain, but it can get a bit harder with too many.
And even on a 26.5" seven-string, the low B strings just don't sound very good to me, nor do the low B's available for 34" and 35" scale basses. You notice people playing these instruments do not spend much time on the low string, certainly not like a bass player rides the low E string. And when I hear a good guitarist referencing a violin partita in standard tuning though, it reminds me that you need to have solid reasons to chase off the smooth paths....
http://www.youtube.com/watch?v=X6TLMVteNpI
I had some carpal tunnel/trigger finger stuff that was obviously related to seven-string guitar/five-string bass, so I'm back to normal tunings, widths (and string-skipping) for now at least. The seven string forum has a whole group of people chasing after this stuff hard:
http://www.sevenstring.org/forum/
Fun group, although often munched by cut'n'pasters.