Graphing filter

So here's my small request...

In the graphs, there is already way to limit the results to "Tri Sports Only".  What I keep thinking would be really helpful would be to have a filter for "Run only", "Swim only", and "Bike only".

The problem I encounter is this.  Sometimes I want to see how my volume has changed over the course of several weeks or months.  Perhaps I'm checking my periodization, or I want to see how much run focus I've had versus swim focus.  In today's results, I get the stacked results with bike info on bottom, then run, then swim above that for each period.  It is easy enough to see the relative size of the bars for the bike, since they all start at the same level (the x-axis).  However, it is nearly impossible to compare the other two to see how each week compares to the next in that one sport.

(If that request is too easy, the fancy version of this request would to be to add a z axis and make one row for run, one for bike, and one for swim, like the 3D charts in Excel.)