No there wont be a rappel script, there isnt a rappel script on any of our other addons so i dont know why you would expect one on this one...Rappelling is the method used to come down cliff edges, also known as abseiling, the abseiler has to wear a harness and can control his speed with a belay, sometimes done from helicopters but there are faster insertion methods, like fast roping, which is like sliding down a firemans pole, the only resemblance to rappelling is that they are both methods of getting down from things...
This is fastroping:
And this is rappelling/abseiling:
If by rescue rope you mean this:
No, this isnt going to be on the MH-60.