Here is my take on snorers and shelter ettiquette. Shelter space is determined on a first come first serve basis. This is commonly accepted. Are there any rules in place that govern snorers? No there is not. So if you snore and there is space in the shelter then you have every right to move into the open spot for the night. Will all the other hikers that stay with you that night have to "deal"? Yes, they sure will.
With all that being said, I would like to point out the topic of this thread, which is "Shelter Ettiquette". The only problem with snorers is the noise that their snoring creates and sometimes the vibration and rattling of the shelter walls, roof, etc....(most have spent at least one night with a chainsaw snorer). Snorers who know they snore and stay in a shelter knowing they may keep others awake all night to are inconsiderate if you ask me. If they were to stay up all night being noisy and talking one would probably consider them rude and I would venture to say that some may even "shoosh" them. Noise is noise....sleeping or not. If you choose to stay in a shelter and you are a bad snorer, you are saying that you do not care if everyone else in this shelter doesn't get a wink of sleep. In my opinion.....bad etiquette.
I agree with you totally Komodo on the leki thing. When someone comes to a shelter and warns of their snoring we forwarn, "poking rule" in effect".