Another trick I do, is, for precise placement of materials, say a scree slope, is to use a greyscale image
you cna copy & paste the terrian image from the terrain editor to Photoshop etc, or save it out as a tif or jpg
then use that to work on material layers, or a mixed material

using a greyscale image, you cna set it so that sya, blakc = scree slope material, white = rock
and so fort

also, you cna make screes by simply butting up extra terrains into the main rock cliff! ;)
commonly folk use multiple terrains, of varying materials and types to ahcieve a landscape, not jsut one monolothic and very tricky terrian object

so you can have a foreground terrain for the dino foot prints, leading into a scree slope with a different material, which leads into a cliff side, etc.

that any help? :)

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