Some of the things on this list I've never encountered and seem a little like fluff for the post (not being able to copy stuff? hijacking regularly used keystrokes? how often is that happening to you, really?).

Navigation/history tracking is an ongoing battle within SPAs. Not rocket science but if not part of initial planning definitely becomes a problem to implement after-the-fact. Agreed this is something to work on across the web.

But I will take the scrollbar thing into consideration in my next site. I am very guilty of this.