Being in a bit of a unique position (part scientific, part contemplative) I reckon the stoney community is well placed to invent new words and enrich the language. We've had some successes - megarak springs to mind, and stonerowing, and there are probably a lot of others that escape me. Four Wind's "Landscape Antiquarian" has a good chance, and considering how Google picks up this forum I bet it will be there in a few days.
Now, Mr Hob has come up with a beauty - "Stone Bothering". It hits all the right buttons - there isn't another way of saying it and it describes it perfectly. I see it as referring specifically to the Swallowhead Springs plastic trash type of stuff and it's virtue is that it distinguishes that from "littering" which is random and unconnected with the site and "vandalism" which is permanent or temporary physical damage, albeit sometimes belief inspired, such as candle grease or chalking.
I see "Stone Bothering" as a temporary reversible assault on other people's appreciation of a place. Thank you Mr Hob. May immortality be yours!