You can build your own filters and by clicking on a column header using the second mouse button and selecting Show Group By Box.

customisefilters.bmp

Using the mouse, drag a column to the top of the string editor window and drop it in the grey shaded area. This will group strings in the editor by this column. You can drag any column header into this region and create more complex filters by nesting them beneath each other. For example it is possible to create a filter that displays all dialog boxes with untranslated text.