Huh, I enabled com.onyx, restarted, then launched the Onyx launcher and the round Home button works great! Here is how it responded:
Code:
09-02 00:08:54.887 1336 1439 V InputDispatcher: Asynchronous input event injection succeeded.
09-02 00:08:54.931 1336 1439 V InputDispatcher: Asynchronous input event injection succeeded.
09-02 00:08:54.933 3454 3454 I DeviceReceiver: Received[27]: com.android.systemui.HOME_BUTTON_CLICK data null
09-02 00:08:54.933 3454 3454 D EventBus: No subscribers registered for event class com.onyx.android.sdk.common.event.HomeKeyEvent
09-02 00:08:54.934 3454 3454 D EventBus: No subscribers registered for event class org.greenrobot.eventbus.NoSubscriberEvent
09-02 00:08:38.367 1336 1454 I chatty : uid=1000(system) ConnectivitySer identical 2 lines
09-02 00:08:38.368 1336 1454 E ConnectivityService: Exception in removeRoute: java.lang.IllegalStateException: android.os.ServiceSpecificException: No such device (code 19)
09-02 00:08:54.942 1336 1355 I ActivityTaskManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000100 cmp=org.ds.simple.ink.launcher/.LauncherMainActivity (has extras)} from uid 0
09-02 00:08:54.968 3454 3454 I DeviceReceiver: Received[28]: onyx.action.top.component.change data null
09-02 00:08:54.969 3454 3454 D EventBus: No subscribers registered for event class com.onyx.android.sdk.eac.event.EACTopComponentChangedEvent
09-02 00:08:54.969 3454 3454 D EventBus: No subscribers registered for event class org.greenrobot.eventbus.NoSubscriberEvent
So it looks like the notification bar is tightly connected to the Onyx launcher