Hi Benkit
Have a look elsewhere in the forums for interest other people have shown in using the Pi in car without a screen using a phone to control it via WiFi.
For this approach the Pi (and therefore RuneAudio) has to host a local WiFi network in addition to playing from an attached hard drive, SSD or USB stick. Playing from an attached drive is RuneAudio's core business and 0.3 Beta does this well.
Adding the ability to host a local WiFI network is where I'm stuck.
I REALLY hope that 0.4 beta includes this. (It's rude to ask when 0.4 might appear!)