So a quick note for all users of the chart2 UNO API.
The data point objects support now the com.sun.star.drawing.FillProperties service similar to the other chart objects. This finally allows to access all chart2(not chart1) objects with the same fill property set names.
For the data points we now have the additional property names:
This change will be available in LibreOffice 5.1, currently scheduled for the beginning of February 2016.
I also filed an EasyHack to support FillTransparenceGradient, FillGradient, FillHatch and FillBitmap which would simplify handling of the fill properties even further.