I'm pretty sure that's just for crafting, the unlimited building option is for building, and its for the restrictions, and not unlimited materials. If you get low on materials just go to the Dev room, there's a box with 500 of every craft material just sitting there. That's more than enough to pimp out most if not all of your settlements, especially if you go through and scrap everything you don't need first.
Yeh, we coded it so that it doesn't work on Monday and Tuesday. Should work fine the rest of the week.