Currently, the quick menu shows all items with non-zero circuit signals. I think this should be an optional feature (how about a checkbox above the quick menu for quick toggling?) because there's people who have one big logisitics circuit with all the signals for base-wide information passing.

It would be absolutely wonderful if this same feature helped us set up enabling conditionals in all entities, not just inserter filters. Currently the quick select is usable like this for inserters by pushing q on the icon then on the circuit icon box, but only if you have some of that item in your inventory...

The second point depends on a normal game setting that gives you a ghost cursor if you don't have the item. Enabled that, and you'll not need the item in your inventory.