I'm using the virtual GPS as a strong and very useful tool. Virtual GPS has the ability of grouping the entries by some of the cache entities. When having selected a "group entity" the display changes somehow into sub sections. Any of that sub sections starts with its "sub section title" and ends with a "summary line" containing some numbers in its second and third column.
I'd suggest that one can with one click select such a "sub group". Therefore a "selector" could be added into the first column of the "summary line". Its function should "on selecting" be the selection of all entries of that group. A similar function for the complete (or viewable) grid is still available