I often thought the same thing. There doesn't seem to be though. But I will bet that if you wandered around you might find some old pins/slings on some of the most obvious stuff. Either way, plenty for someone to do if they want to do the work.
I saw some rap slings north of the north descent gully last weekend, the guy at nomads told me there might be some info in the new tahquitz guide. Too bad falcon won't publish it!