I'll take a look at it - not sure I want to add more buttons, I'll see how it looks or maybe hold a key down whilst clicking.
You can direct entry into the date field - you can have a try with English as well, for example 'Yesterday', although what works and doesn't depends on your OS version and localisation settings.
One more note, the scrolling increment depends on the time scale of the basic graphs - the bigger the scale there (set in the prefs), the more scroll you get on the buttons. Also note the satellite imagery is linked to this scrolling/date entry, so you can see the sat imagery for any date as well as the daily stats.