texture coordinates

is there a way with the current sdk to change the coordinates for the vertexes of a quad in either canvas or webgl?

Yes, but only really in WebGL mode. See Tiled Background for an example: in canvas mode it draws using a repeat canvas pattern, and in WebGL mode it draws a single quad with special texture coordinates to cause a repeat effect via quadTex. However, since canvas 2D is a limited 2D API which doesn't give you access to texture co-ordinates, that's about as far as you can take it.