Bring back separators in toolboxes we can place where needed
Ai used to have separators in tool panel, dropped somewhere after 2012, with a major UI redesign.
Now we can customize our tools panels, but we can’t place separators between groups we make.
Please, give them to use.
Also look at related request about docked tool panels row stacking:
...because without these I started thinking about a plugin that just adds several blank tools with lines, to create sub-groups in tool panel, like in this image.