Well, first of all, I think Expert Marksman should be renamed "Scout." There are plenty of "Expert Marksman" skills which work fine on rogue-type characters, but it seems a little counterintuitive to level an ability named Marksman on a character who will never touch a bow. A name change would dispel some confusion.
I definitely agree about the special arrows, though. Marksman (or Scout, or whatever) doesn't really need a huge skillset in order for range-type characters to have decent versatility. Scoundrel, on the other hand, definitely needs more tricks, including more which aren't dagger-based. I feel the rangers just need barely enough to actually have to make choices (ex: can't use all available skills unless 5 ranks in ability), and not a whole lot more than that; Scoundrel, on the other hand, needs a lot more than it has now.
