Put some values to scroll by in that constant. At the moment you are scrolling 0, 0. It's in UV space so 1 = a full scroll around. Try 0.5 or 0.3 or 0.7.
Posted a couple of days ago. Might be of help. http://www.crydev.net/viewtopic.php?f=315&t=100319&utm_content=buffereb577&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
for 1, i'd select the two edges you want connected with one edge and dopolySplitRing -ch on -splitType 1 -weight 0.5; then split polygon to connect the edges for the triangles