update: http://forum.xda-developers.com/showpost.php?p=45685145&postcount=381
dev posted exciting news, "Now the minimum set of features that I wanted is complete. It works even better than I thought. The Pioneer App only shows that small icon in the status bar to indicate whether it's connected or not. Once you connect to the radio, that annoying Pioneer app homescreen is not even shown, you get full mirroring right away!
Only thing left to do is to clean the code a bit and do a few more tests. Now I am pretty tired so getting some sleep first. Tomorrow evening I will make a first