I would like to propose a substantial update to the spot healing/clone tool in LRC. It's BY far the number one reason to leave LRC and use other tools. It does not do any analysis of contrast and lines near or in the marked area to heal or clone.
ESPECIALLY if you wish to remove something along the border of the image using healing it is useless. The repair proposed, always fades away from black outside the image in the first many pixels. The same happens inside an image if you mark something along a contrasty line. Please fix this so the tools understands lines and proposes heals with the same contrast/line as the surroundings.