Include timeslot breakdown in participation reports

Right now there is no easy way to go back and see how many volunteers participated in a single timeslot of a past event if there were multiple timeslots in one day, as the participation breakdown is by day, not by timeslot.  This is particularly true when participation is based on volunteers who signed in and not just volunteers who registered.  Modifying the participation report (perhaps adding another column to the 'reservation code' version of this report) or creating a new report, with this information would be very helpful.  Alternatively, adding total sign-ins information for each timeslot in the 'view/register volunteers' section of the events would do the trick.  Just anything that gives you that headcount when you're looking for it down the road.