Robotic arm option that can filter/pick up only stackable or unstackable items

I think it would greatly simplify many base automated filtering setups if we could have an option on robotic arms to only pick up stackable or unstackable items. This could make some interesting base filtering setups, especially where the last step in a base filtering system is a collection of auto-salvagers. No need to have every item go all the way through a base filtering system since most items that end up being salvaged are unstackables.