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Try following Pepin's video https://www.youtube.com/watch?v=nfY0lrdXar8 and do a chicken ballotine. It's not as easy as Pepin makes it look, but it's also not as hard as you might imagine. I'd highly recommend deboning the chickens a few days ahead of time and dry brining them.
Agreed about learning proper technique to use a knife for dicing onions. Once you watch some Youtube videos and practice on an onion or two, it's so much easier to use a knife than to use any other type of gadget, especially when you factor in the time it takes you to drag the gadget out of the drawer or cabinet, put it together, use it, and then clean it.
They make an oval ring that you can cover with foil to make a homemade drip pan. I use that all the time. It fits perfectly over the oval stone.
I have their half-circle stone, which I use quite a bit when I want to do a mix of direct and indirect cooking at the same time. I also use it when I cook steaks. I'll put the steaks above the half stone at 275 for the indirect part of the cook, then crank up the heat and throw the steaks in the fire for the sear. That way, I don't have to pull a hot stone out of the grill in the middle of the cook.