I really miss dragging “Space between items” all the way to the left to get to zero. The dragging functionality is much too sensitive now. Same goes for other number inputs that can have negative values like drop shadow positioning and spread.
It would be great if it were a bit harder to drag to negative values, at least for properties that are less commonly set to negative values. Maybe there could be more required mouse drag distance to cross over to negative values, or a shortcut like this suggestion.