I was just thinking to myself now, it would be great if there were filter options or whole new unloaders of these that had filter options but required something more to craft. Would be up to you how you would want to to it. I was thinking these could have a larger filter UI in them then just 1 or 2 slots, probably about the same as a constant combinator just so we have the ability to use them still to unload multiple different items at the same station.
Hope you find this suggestion useful and informative!
Nick