It'd be nice if users were able to adjust the brightness of a cloned area before or after cloning, using a slider on the clone tool sidebar.
For instance, sometimes you want to clone part of a wall, but the area of the wall that you're cloning to is more shadowed (thus darker) than the more-perfect source part of the wall.
This could be added to an enhanced set of clone tools, including the ability to rotate or flip a clone stamp, which I know has been requested in these forums before.
Thanks!