Worked Time Chart gadget doesn't have calendar date picker

Worked Time Chart gadget can have custom time frames - to do this, you need to click left or right arrows (<<, >>). If you want to see chart for a January 2013 you need to click it 52 times, where after each click you need to wait for about 1 second (obviously depending on hosting machine load and your connection). Needless to say, a simple calendar date picker would make life easier.