Response from the site administrator
tompaton, 31.08.2014
Good news: Pace is already available as an option. You set it per tag (so that you can use speed for bike rides and pace for runs, for example.)
Go to your "Run" tag, click "Edit" then choose "Pace" in the "Speed display format" section.
Also, that's a good suggestion re using bar-charts for the histograms, I'll consider it and see what I can do.