It would save a lot of painting time if we had an option to let stamps in subtractive mode colorize the mesh as it does when in additive mode.
For instance, let's say I sculpt a rock-colored mountain, and then want to cut away the top to make it a grass-topped plateau. It would be useful to just take a flat stamp with a green color, and cut away at the top.
Additionally, it would be useful to be able to change the paint cursor to be a custom stamp. Having only a sphere and a spray can is very limiting.