Mr. Pint,
You could probably use that high-$$ line for any sort of mooring or even anchoring line in a pinch... but I seem to recall that the built-in vital performance characteristic of "climbing rope" is that it can stretch XX percent to stop/cushion your fall down the inevitable rock face, and then has to be replaced because that extreme line-stretch has become permanent.
This would be quite different than three-strand nylon anchor line which recovers from repeated shock loads, such as your boat surging on it while at anchor in some choppy bay or cove.
Or am I mis-remembering what I thought I read? (wouldn't be the first time...)
Loren