@oiv: to stop the system sounds you have to put silent profile, which will stop QRadio as well. Instead put QRadio as same level as system sounds editing the file /usr/share/policy/etc/rx51/syspart.conf adding at [classify system] (should be line 270 around). In this way radio audio won't stop if you get an email notification. Incoming call will still stop it if you have latest versions.

Version 0.4.5 in extras-devel, which enables short camera button press to switch to next saved station. Option is found in settings window and it's enabled by default. Won't interfear with shortcutD, but pressing the button will trigger both of them. QRadio will force button active even when device is locked.