"None of this is Sculpting PageRank as anything "not index" does not have PageRank." I think you're missing the point, if a .js file is used for redirecting to meta pages and google can't access it, then you're preventing unnecessary pagerank leaks.
I see where you're coming from, and certainly anchor text would be a footprint so it's best to, as you say, ley them: "fall as they may". But I disagree with the notion that donation pages don't provide patterns. I think the *do* have have footprints