A very good point, that’s something I’d been thinking about as well. At least with the new release, you can unstuck the crafter in this situation by deleting the item they’re stuck on, which wasn’t possible before. Even so, your suggestions would be better. Also, I don’t think a warning like that is in yet.
Another one that I had noticed but not yet reported. Again, seconded.
What I do is just have the bed(s) outside until the houses are done. Although I was presented with an issue surrounding that recently.
This one was suggested here.
Nope, that’s unfamiliar to me as well. It sounds like other gathered foods were not recognized somehow (I have seen it happen that far-away berries that were picked from bushes don’t get retrieved), but then, for the farmer to continue eating every turnip he gathers, something else must be involved too, where eating somehow doesn’t reset hunger levels; probably everyone is hungry, but the farmer gets first pick every time he picks something because he’s right there, or something. Regardless of the reason, I have not encountered anything along these lines. Feel free to make a report about it in a separate topic if you want to help out more 
That’s true, and often times the blueprints for windows and doors just get shown even when they’re not placed. Opening and closing the building dialog removes them, but they return quickly. Not sure why, but it’s something like this issue.