When you put a transparent pixel there the system just repeats that, so its being repeated anyway, just invisible. I might try to make a version that stretches the first couple of pixels. Also a version that seamlessly loops the contents.
About iPad and dissolve - I'm using the fastest way of getting rid of a pixel - just stop drawing it, using a "discard" command. Guess the iPad implementation just decides to discard everything once it gets that command. I might look into a version that just sets opacity to 0.