Somewhere along the way I recall someone manufacturing a super duper boat bungee cord. The gist of the thing was that you would attach one end to an anchor and the other to one of the stern eyes of your boat. You then drop anchor a ways off from where you planned to land and then motor in, stretching the bungee out. After you unloaded your stuff, you attached another rope to your bow eye and let the bungee pull your boat back out and away from the rocky shore. How these things actually worked in practice, I have no idea. Would the anchor come loose in a blow, or would the bungee allow the boat to be moved around alot? No clue. Just remember seeing this. Seems to me that if you were in an area protected from wind and waves, it just might work.
George
If people concentrated on the really important things in life, there'd be a shortage of fishing poles.