Yup! I've knowen about this for a very long time as well. However, I rarely do this unless it's a very difficult design that I've made for someone, or that I'm giving out a preset that I've already made. Otherwise, I do give the files when they're ready. Not the GIMP files so they can access the layers, but the images themselves. It's harder to edit the image without the layers (I've tried upon request- vedy vedy hard).