Well my needs in fact both because i need ropes for climb but in terms of level design is not nice to place a rope i need put a bunch a tiny blocks to create the rope the same thing for rope of fishing rod. is the way for create this.
So I want implement a sort IK you father and childs, terminator. The father could be an anchor or pin, the slug can be cloned by code assigning child IDs and terminator for finishing the rope