Quote:(it would be faster if I could get it into some spreadsheet format and just filter, but I don't know how to do THAT)
I'm pretty sure there is a spreadsheet view in Blender somehow. I think I've seen it before, but I can't remember where. I'll have to look into it.
Also, I think I found a solution to the terrain blending: https://www.youtube.com/watch?v=SjtItfeyHII - I haven't tried it yet, but this looks like exactly what I was looking for. It automates both the texture and normal/geometry blending between things like rocks and terrain.
And here's a cheaper, but more manual process that does similar: https://www.youtube.com/watch?v=6auecD4Rhx4