Like many, I have benefited from your contributions to BPL- just the other night I used the slippery half hitch (I still remember those great illustrations) to tighten my tarp during a snowstorm, and went entirely stakeless. And the given the right situation, and the right smooth rock, I might consider leaving aside the TP. But I can't promise the dual use pee bottle will become part of my kit!
Seriously, though, some practical questions. As long as your are, ahem, using your own bottle all the time, I take it the actual health risks are very small. Do you find that there is ever *aftertaste*, or is that what the morning coffee is for? Perhaps some Tang?
One advantage of a floorless shelter, or a floorless vestibule area, of course, is that one need not leave the shelter, particularly if there is snow. I recall a recent thread here discussing the disposal of both liquids and solids in this manner in very fowl weather. Don't know why that has never made the cover of the REI catalog.