Legend labels on class breaks

Is there a way to create a legend for a classified vector layer that labels the separation values and not the classes? For a very simple example: if I am displaying temperature data in only 2 classes (-10 - 0 and 0 to +10) I would like to have 3 labels on the legend ("-10" centered on the bottom 'line' of category 1, "0" for the division lin between the two classes and "+10" at the top of the colorbar.... I find this would be much more intuituitive than the default two labels of say "-10 - 0" and "0.00001 - 10"

thanks

Travis Logan