It would be great to be able to adjust the vertical scale in the History Charts.
Because sometimes there's a massive peak value in the chart that makes the other values impossible to read.
You can make selection within chart using mouse. Chart within selected rectangle will be stratched to size of the chart.
If you need to return chart to previous state - just make selection from bottom right to top left corner using mouse.
I think it would be handy to have a scrollbar to the left of the vertical scale that allows you to make the graph zoom in to the selected value.
This would obviously only be usefull for performance charts, come to think of it.
Mind you, the mouse-select-rectangle works OK (well except for the selection line color being white on a light-gray background, but that might be adjustable?)