Yes whemy, this does happen IRL. I remember at my high school there was a grassed slope between two different elevations of pavement. Only a few months after it was grassed, there was a nice muddy slide at the corner because that\'s the way everyone walked to get from one part to the other.
And while yes, paths can be made by hand (I\'ve participated in a few service projects in state parks creating trails), they will occur natually if enough traffic walks through them.
Heh, this just reminded me of a Navy joke my father said the other day (don\'t ask me if it\'s true or not, cause I don\'t know):
Apparently when a new military installation is put in place, they don\'t bother to put down footpaths in between the buildings. Instead, the engineers leave the ground as it is and wait for several months. The sailors eventually find the quickest route in between the places they need to go, and a path eventually wears itself in. Then, then contractors go back in and put paved walkways where the beaten paths are

EDIT: Oh yeah, back on topic

Dynamic paths in PS would be kinda cool, but very, very unlikely due to 1) the amount of coding to be involved, and 2) your client would have to download the most recent \"path map\" every time you logged in. So in short, I wouldn\'t count on it. But then again, you never know...