When we are in a 'Detailed Report' view, or any other view that has a list of entries, make the entries selectable by click and show the total hours ( cost ) of all the selected entries.

Sometimes we quickly want to calculate the hours of a few entries and it would be very convenient to be able to do that by just clicking on an entry to select it and automagically show the total of the selected entries somewhere.

Doing the same with filters takes longer, is inconvenient and sometimes even impossible, if there is no common wording in the title of the entries.