Mod Portal: https://mods.factorio.com/mod/ghost-mode

Toggle "ghost mode", making all items you place a ghost item regardless of what's in your inventory. Bascially, it holds down Shift for you. With ghost mode enabled, using the pipette tool (Q) to pick an item will also always pick a ghost item. Ghost mode can be toggled via the default key binding Shift + G or the shortcut bar.