Yeti is a great beer, and Great Divide makes many versions of it and they are all really good! I don't have the recipe in front of me, but a friend of mine put together an imperial stout that tastes very similar to Yeti. No MO and he used flaked barley and flaked rye to give it a smooth mouthfeel.
As for MO, I read somewhere, maybe on this board somewhere, that Drew Beechum (I think it was Drew) does or at one time used a ratio of 1/2 2-row and 1/2 MO as his base for many of his ales. I recently tried this and changed my APA recipe from all 2-row base to 1/2 2-row and 1/2 MO base. Really liked the results and I got more of a toasty flavor from the MO than biscuity. I now keep on hand a 50lb bag of MO along with 2-row as I'll be using this 1/2 ratio of 2-row and MO as my base for my APAs, IPAs and Ambers. My wife really like our Amber from last year, which had a 2-row base, but we are going to brew up an all MO Amber for the fall soon.