My post was an idea for a mod I thought could work well in my Modpack and I was actually already thinking about firepits a bit, just getting said fire would be really hard. As in, you need to search for lava or active fire and right click it with a stick.
But the kiln is a nice idea. As for the Clay Ore Thingy, I was basically working my suggestion to feed into TiCon Iguana.
In my mod, I removed charcoal in favor of Railcraft coal coke, but a log pile is a nice idea too. Finally, flint is actually a type of stone, albeit a very valuable and useful one, of course since stone can't be crafted like normal tools, Knapping and tying tool heads around sticks are necessary.