Thanks for the description R0J0hound! I'd add the normal quadTex function only allows you to specify texture co-ordinates as a rectangle, but quadTexUV allows you to specify the exact four texture co-ordinate points. This is useful for things like mesh distortion, and we actually ended up using it in the Tilemap plugin for tile rotation and flipping.
There's no need for a new SDK download - just use the function and it will work in r152+.