In general for most people poop is no fun, however, if you play in the butt, anything is possible and expected.
Like some others have mentioned, prep in different ways, should keep you good to go for what ever you plan to do. If I am going to just play a little in my rectum, lets say not deeper than maybe 3 inch pass the spincher, I just do a BM, followed with a balloon enema.
Than of course I do keep an eye out for possible poop on my toy, if it gets on it, I just pause, clean and repeat.
When I play for a real session, I spend 45 minutes or so doing 4 enemas to be as much clean as I can be. Still not 100% fool proof, but you can pretty much spend hours on all night feeling secure. And if something decide to show up anyway, just take a break.
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My thoughts are, I don't like poop, but its not the end of the world.