speed vs time not available in v0.4.3 ubuntu 12.04 + speed units

Hi

first of all: thanks for the great software!

I see on the webpage that you have an x-y plot of speed vs time (or distance), but my gpxviewer has no menu option to show this and I don't see any way to change something in a config file somewhere.

On the webpage such a plot is shown below the map. I can do View->Multiple Tracks -> Aggregate Statistics, but this seems to be a week-overview, not of the particular trip that is selected (when having loaded several).

I have installed from the ubuntu 12.04 on a macbook pro 6,2 with fluxbox as a window manager (if that matters). I run from the commandline and get no errormessages when loading the .gpx file.

Second question:

the webpage shows km/h units, but my interface has m/s. Those units seem to appear in the python files /usr/share/gpxviewer/... Is this an Ubuntu thing? Should I compile my own version to change units?

thanks,

indium