When using this tag it removes the lines from both the listbrowser body and columns title bar. It should not remove them from the columns title bar because you can't see where to grab and drag to change the column width. You can guess and get close if the column is sortable/clickable.
If you look at Windows Explorer you see the lines in the columns title bar but not in the body. I would like it like that, if through a new tag if need be:
LISTBROWSER_TitlesVertSeparators,TRUE,
LISTBROWSER_VertSeparators,FALSE,
LISTBROWSER_VertSeparators
LISTBROWSER_VertSeparators
Workbench Explorer - A better way to browse drawers