Maximum Input Q

[Vectorus]

Say I have a small source of high quality metal, together lots of low quality metal. I want to make sure the small, high quality source is used for important things like shipbuilding and weapons, while bullion, plantpots, picture frames and so on can use any old junk. 

It would be a practical and easy quality-of-life improvement to forbid certain processes to fetch input resources above a certain Q.