I've been playing around all night.
The conclusion is: 0.3 alpha runs much better than I was thinking in the beginning.
Installing wlan is a bit tricky, but it operates well with logilink mini adapter.
I wasn't lucky with Edimax. That one didn't really work for me. But no problem.
I even got direct smartphone connection running by making it a hotspot.
Library updates after every reboot although auto update is disabled.
Many radio stations don't work or start 1 time out of 10 trials. A few run safe. With jamendo everything is fine.
Now there are no frequently short connection losses anymore. That was a browser issue. With firefox or chrome on the mobile UI works solid. Although chrome interrupts sometimes, but you get easily back . That's a chrome bug and will be probably solved with next update.
So radio is the only real problem I see.
Fortunately I don't use NAS

The most important thing: SOUND IS THE COMPARABLY BEST AT THE MOMENT!
Well done!
Greetingz, Robert