Don't we all find it annoying when you have to craft a shitload of the same item over and over and over again?
Well, this suggestion came to me after thinking of Guild Wars 2.
Basically, whenever you want to craft an item, you could fill in an amount to craft in a menu that pops up when you click on the item from your F3 menu.
Then the system starts to craft the items 1 by 1, and the amount goes back from what you filled in to 0. And when it reaches 0, it closes the menu again and you are done crafting.
Maybe you could also make the bar go faster if you craft a lot of items at the same time, so that it doesn't take an hour to craft 100 fences. Or something like that.