In regards to using items held by companions at camp, I tend to just play it like I actually have them all with me, but due to gameplay mechanics and limits on technology, some people just have to be camped. I don’t really want to play a ton of characters at once in a turned-based game, but in real life I would totally have my whole group out and about with me if at all possible.
Being able to see the full spectrum of colors that actually exist in the world. Every very rare once in a while someone is born with more cones in their eyes, which allows them to see more. The rest of us, though, will never know.