ctrl + W = Copy
shift + D = Duplicate
shift + B (while a face is selected) = select all faces in that brush
shift + click = apply currently selected texture
alt + right click = select a texture from a brush face
alt + left click = apply to different brush face
shift + s = select all faces
Sure there are lots more. But those should get you through many of the basic operations. Plus I don't remember thigns well. So those are just the ones that I know are correct.
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