Its probably been mentioned before butafter creating several hundred bricks I feel it's worth mentioning again.
The ability to set the amount you want to create when crafting an item of the same type.
Yes I do understand that some materials differ and we're supposed to find the best material for our needs etc. etc. However after creating around 500 bricks I have to say it's a needed feature. I've clicked my right mouse button well over 1500 times, not including gathering the material and fails. Not sure why it only works with the right mouse button but that's another point entirely.
But theres no way I can see myself to do any type of major crafting if I'm going to wear my mouse out doing so.