I've been thinking about this for a while and I feel like i'm spending a lot of my mining time just individually dropping pieces of ore that I don't want, mostly copper and iron. It's pretty tedious to hover over each individual ore in your cart, wait for the drop popup to appear, click it, and then wait for lorwolf to catch up with you.
My suggestion is really simple and (maybe) easy to implement. Have different options to "drop all" of any ore type. For example:
Drop All: Copper
Drop All: Iron
Drop All: SIlver
Etc
And...
Empty out entire cart/drop all ore
Instead of clicking each individual ore, you'd have the option to get rid of multiple pieces with just one click to save time and remove the tedious nature of it. After all dropping is important to save wheel durability if you don't wanna keep going back and forth to smelt unwanted copper that keeps infesting the cart.
PS: This should not remove the ability to remove individual ore pieces! This should just be an extra option for people like me who wanna go scorched earth with their cart a lot of the time, lol.