The scope of CEV is humanity: Not just the designer's volition, and not the volition of non-human intelligences. Why?
If you exclude non-humans' volition (except indirectly if humans care about it), then why not exclude the volition of all humans but the designer (except indirectly if the designer cares about it)?
If all humans' volitions were identical or very similar, I could see an argument along the lines of Drescher or TDT. But they are not.
So, you could include the volition of all entities, but only the portion which overlaps with that of the designer. This would indeed consider humans much more than non-human intelligences. But that gets into dangerous territory, with educated Western liberals getting a higher weight (assuming that the usual crowd develops the AGI).
Inspired by Don't Plan For the Future.
For the purposes of discussion on this site, a Friendly AI is assumed to be one that shares our terminal values. It's a safe genie that doesn't need to be told what to do, but anticipates how to best serve the interests of its creators. Since our terminal values are a function of our evolutionary history, it seems reasonable to assume that an FAI created by one intelligent species would not necessarily be friendly to other intelligent species, and that being subsumed by another species' FAI would be fairly catastrophic.
Except.... doesn't that seem kind of bad? Supposing I were able to create a strong AI, and it created a sound fun-theoretic utopia for human beings, but then proceeded to expand and subsume extraterrestrial intelligences, and subject them to something they considered a fate worse than death, I would have to regard that as a major failing of my design. My utility function assigns value to the desires of beings whose values conflict with my own. I can't allow other values to supersede mine, but absent other considerations, I have to assign negative utility in my own function for creating negative utility in the functions of other existing beings. I'm skeptical that an AI that would impose catastrophe on other thinking beings is really maximizing my utility.
It seems to me that to truly maximize my utility, an AI would need to have consideration for the utility of other beings. Secondary consideration, perhaps, but it could not maximize my utility simply by treating them as raw material with which to tile the universe with my utopian civilization.
Perhaps my utility function gives more value than most to beings that don't share my values (full disclosure, I prefer the "false" ending of Three Worlds Collide, although I don't consider it ideal.) However, if an AI imposes truly catastrophic fates on other intelligent beings, my own utility function takes such a hit that I cannot consider it friendly. A true Friendly AI would need to be at least passably friendly to other intelligences to satisfy me.
I don't know if I've finally come to terms with Eliezer's understanding of how hard Friendly AI is, or made it much, much harder, but it gives me a somewhat humbling perspective of the true scope of the problem.