I've once again switched my window manager. I dropped Xfce in favour of Fvwm (actually Fvwm Crystal since I dont want to mess too much with configuration files). Besides I also use Kazehakase instead of Firefox as my main browser now. It's all a little less convenient but the performance gain on my old laptop is great. Furthermore I compiled myself a new kernel and now got full working powermanagement features (I had experienced overheating during emerge -unD world ).
Other than that I visited Braunschweig today, where Daniel Willmann from the FSO-Team organised a buzz-fix party for neo freerunners. Now can enjoy buzz-free phone calls

You are a Freerunner owner? You take care of your device? You don't want to spend a lot of money? Continue reading.
It only takes a few minutes to create a simple protector for the touch screen of your Neo Freerunner. Just get yourself some overhead transparency. Cut an exact rectangle sized 6.4cm * 4.8cm (What? You want dimensions in inch? Go fetch your calculator ). You might think it is too large, but trust me, it fits into the edges between case and screen. However before inserting make sure there is no dust left on the surface.
I know this is not a perfect professional solution, but for me it works. I sometimes use a real pen on my screen by mistake. In this case I just create a new protection shield.