Good idea Bruce.

In my experience:
<> The sort column of a Grid is indicated with a symbol that also shows the direction of the sort
<> A Left-click selects the sort column and if already selected, changes the direction of the sort
<> A Right-click brings up a context sensitive menu (windows standard) and as Bruce suggested would be a logical place for the "Column settings ..." option. As is already done, this should apply to right-clicking anywhere in the grid, not just the column headings

While improving the default columns is possible, I believe that's an area where the scope is too great and you'll never please everyone. Also, beware of removing a column to make way for an "improved" default ... someone is sure to miss the one that used to be there. Better to focus on making them aware that it can be customised with a "Tool-tip" as Bruce suggested or a note in the Adagio Status Bar's left hand panel.

Pete