Perhaps being able to filter what items are shown could be useful.
Maybe based on presets/categories like belts, chests, trains, combinators. Some ideas about categories:
Belts - all belts, underground belts and splitters.
Pipes - pipes, underground pipes, tanks, pumps
Chests - all storage containers, maybe including logistic chests (or they can be in a separate category)
Inserters
Trains - locomotives, tracks, stations, signals, cargo, tank and artillery wagons
Combinators - all combinators, red and green wire, programmable speaker
Electric distribution - power poles and substations
Logistics - roboports and logistic/construction robots
Turrets - all turrets. Maybe ammo, but it isn't placeable and to be honest I'd rather have it on my quickbar.
Power production - everything related to power productions - boilers, steam engines, nuclear reactors, heat pipes, heat exchangers, turbines, solar panels and accumulators. Or maybe split it 3 separate categories. I am not sure how feasible it is to identify modded power producers though.
Tiles
Furnaces
Others/Default - everything else
For selecting categories I suggest either a dropdown list or a new, separate dialog with checkboxes (and let the users select multiple categories). You could also have per player settings to enable/disable each category and if disabled merge it to the default.
Another feature suggestion - sorting/grouping based on (the above) categories . This can be in addition to filtering but it can be standalone.
