It does not appear that any action has been taken on the enhancement request you mentioned.
Are you referring to the Chart control in the UI, or to the interactive charts that are available when viewing reports in the report viewer? As far as I know, the spacing of the bars/columns in the report viewer charts is dependent on the number of bars/columns. If there are only a few, there is space allocated between them.
I'm not as familiar with the Chart control in the UI, so I don't know what the behavior is.