Penn, I was referring to your comment "Good luck with your enforcement of these rules." As I said, etiquette is a set of conventions, not rules to be enforced. As such, they are much more beneficial on crowded rivers than on less crowded rivers (if there is no one else around, then it really doesn't matter how you fish, does it?). By practicing good etiquette, you can ensure that everyone enjoys the day on the river. The approach that we see practiced on the Vedder is, in a word, selfish (as long as I get my drift in, screw everyone else).
As for your comments about working a river upstream, I want to point out that the whole concept of rotational angling is in reference to specific runs, not about kilometer long sections of the river (which likely contains any number of separate runs, riffles, and pools). There are very few "runs" on the Vedder that are 500 meters long (that would be 5 football fields). While you can certainly start fishing in between two anglers fishing a kilometer long stretch of river, I would hope you would not step into the same "run" below another angler.
It really doesn't matter to me how you hike the river, but I personally will often hike back up a couple of kilometers to my car without stopping to fish water I have already fished. Like wise, I have hiked a kilometer up the river to fish back down to my car (there is a spot mid river where I do this all the time). While I am fishing specific "runs" I almost exclusively fish down the flow, especially if there are other anglers fishing the same section as they will most likely be fishing in the same direction as I. Even when I am alone I will fish a run from the riffle to the tail-out, and then walk back up if I want to work it again (maybe dead drift it this time with a floating line). Perhaps the fact that I fly-fish plays a factor in the number of times I work upstream against the flow (it is simply easier to work the run from top down, stepping down a couple of feet every couple of casts).