There needs to be a way to sell all of one type of mineral you have so that for those of us with say 100s of a certain type don't have to click the mineral hundreds of times just to sell it.
The current auto-sell encourages random gates because its simply faster to get rid of all your minerals that way.
Holding down Shift as you click allows you to sell in multiples of (I think) 5, but something like a Sell All button for individual minerals wouldn't go amiss.