I agree with the need for more competitive options for the off road. Although the stock is quite good for a dual sport tire, there could be a slightly more aggressive tread that would still provide a smooth tarmac ride.
On the old forum this has been discussed in detail, right around the time when folks were discovered the maxxis bighorn, then the duro power and the rest followed.
A tire groover could be an option. I'm due for my third rear tire in about 1000 miles and may revisit this thought. It'd be really nice to chuck out just a bit - perhaps 10 mm or so of tread in between the center blocks. Siping would be cool, I think.
-Adam