I've been stalking this post since it first came out and I absolutely love this scratch WASC!
As for the butter pecan WASC, I would love to have a version of that as well. Keep in mind, I haven't tried it yet, but what if you decreased the amount of milk, added in 1/2c REAL maple syrup (not pancake syrup), stirred in 1 1/2-2 cups diced/chopped pecans, and maybe some butter flavoring along with the vanilla (or maple flavoring). You might have to decrease the amount of sugar too because of how much is in the syrup.
I guess that would be more of a maple pecan cake though, huh? lol. I'll have to give this a shot sometime soon.
I am definately going to be trying the orange version. I have some leftover chocolate icing that I could use for the filling- Orange Valencia here I come!