Issue Navigator columns need to be adjustable for width

Is it possible to adjust Navigator column widths?

What we need is a way of re-sizing the column widths in the issue navigator, similar to the way it can be done in Excel using the mouse (i.e. hold mouse over a column separator and drag it left or right as required). It appears that when you add & remove columns using the 'configure issue navigator' & 'set filter columns' the column widths are automatically set by the system - we want to be able to adjust these.