This would make cherry picking resources for harvesting/prioritizing have a better quality of life for the player.
I suggest the same white highlight that shows when using the Harvest tool should also show when an individual harvestable resource is selected. My current workaround is to open the Harvest tool after selecting each tree or rock I want so I can prevent overharvesting.
This also prevents reselecting resources individually that are already selected for harvest which takes some of the tedium out of the micromanaged harvesting.
Additionally, while the workaround is fine it means players can go from selecting one resource onto the next, instead of repeating selection then open Harvest tool, and repeat.