Arkive says:
a block may be placed once on the route OR it may be placed as many times as you wish for scenery, but not both.
That's an awesome change and will result in much better looking maps--thanks for the additional consideration!
Edit: Sorry, but after thinking about it and looking at my map, I'm still not sure if that really answers my question though? If I have an off-road section of my map, and I use one of those sculpting/variant blocks (like canyon 10-1-7) to alter the part of the terrain that the car touches, does that mean that I can't use 10-1-7 again on the
entire rest of the scenery and it's all going to all be generic cliff-face #1?
That block (and others like it that are only used to vary the appearance of natural terrain) should, IMO, be an exception in an MTC that encourages variation?