String can now be made into wool, so I had a theory.
What about rope?
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2x3 string gives you one rope, and the rope counts as a single block. If you want it to extend more blocks, you have to make more rope.
Keep in mind, the rope cannot be added onto rope, the rope is a single thing. So if you have 15 rope, and 3 rope placed, you have to break the 3 rope and then use the 18 rope at once.
This will be for things like cliffs you need to get down, and can also be used to tie minecarts together, or even a boat to a fencepost. Add an arrow to the rope to make a "rope and hook" for things like mountain climbing, and the hook will be thrown as high as the rope reaches. If it extends as high as the rope is and doesn't tether, it comes down, and has the same effect as a falling arrow: move yo ♥♥♥
A rope can also be used to slowly lower yourself into a ravine, if you place it where the chestplate/leggings go. Sort of like a belt. Make sure you are using the "rope and hook".Then just right-click the block at the end of the ledge, and walk off. Once you fall off, press shift, and you'll hang suspended. Then press Ctrl to gradually descend. However, you cannot walk with the rope tied to you, so this will have to be worked out a bit.
This was more or less a theory in motion, though.






