I found that you can set a request for 0 of an item from every planet (but you can only have 1 instance of an item per group, so you need one of these requests per planet where unload is enabled), which is incredibly clunky as you may have extra structures that are brought around on a normal ...

Suggestion: Allow the ability to filter what items are allowed to be unloaded to a given planet from the space platform.

For example, I have a ship that goes to the shattered planet and collects a set amount of promethium, goes to Aquillo to get fusion power cells and a set amount of quantum ...