I would like to be able to position data labels opposite of the data render on the chart.

Take a bar chart with positive and negative values for example:
If the data has a positive value, then the data label will appear just to the left of the 0 line. If the data is a negative value, then the data label will appear to the right of the 0 line.

I have photoshoped an example here: http://i.imgur.com/0I1jSHW.png