Unable to discern maxima of spikes

[jessereynolds]

If you have a large spike it is sometimes impossible to move the mouse such that the details of the highest point of the spike are shown, so it's impossible to tell the maximum value of the spike.

Perhaps the maximum value could be shown somewhere in the graph that doesn't require a rollover. Or perhaps we can tweak highcharts to make the rollover on spikes like this possible?