I'm sure I'm not alone with this, but I would love a feature that allows us to drop all of a certain ore from the cart. I wouldn't even mind paying moonstones to (permanently) unlock the option, since it's a QoL upgrade and you can still do it manually if you want to save ms, but it would really make mining for specific things easier, especially at higher locations. Currently, I'm drowning in iron and silver.
Additionally or instead (if this makes mining too easy for what you want it to be), I would also love an option to drop everything in the cart, like emptying the cooking pot.