Thanks. Setting the DPI of the images to match the camera's helped with the scaling. Another thing weird about the way OpenToonz handles indexed images is that the 4-bit images are not turned into grayscale like what happened to that 8-bit image. And if I load an indexed image that has a transparent background, the program crashes. So as of now, the importing of indexed images is pretty broken.
As for pixels, when I want to move an image around with the edit tool, I have inches, millimeters, centimeters, and field, but no pixels. So, to avoid confusion, I had to set the preferences to inches.
As for the vastly long image, when I was drawing the pattern, I was looking for the right length of where the pattern of the whole thing resets (it turned out to be very long). Individual parts of it repeat, but because there are eight different bar lengths, making it shorter may make some of the shooting stars look a little jumpy (especially the ones with long trails).