Right now, the minigraph (Total Volume) will show sports. In the future, we plan to give more minigraph options.
For the BIG graphs, yes, we DO give more options to only show the 'Tri-Sports' (so your other sports doesn't dominate). You can see all the extra graph options (which also pertains to planned training too) at: http://www.beginnertriathlete.com/cms/article-detail.asp?articleid=673 The extra graphs are for performance members. You also get the plan analyzer graphs and the race graphs.
Let me know if any questions.