@Timon,
That link you have provided looks to be quite old and referring to the actual mixers with physical faders. When the QU-16 was first released some functions could only be implemented via the mixer as the app took a little longer to catch up.
But like Giga, I have been a QU user for 10 years, 7 of those with the QU-SB and I can also concur, that all the features and functions of the QU-SB are completely available via the app. They would have to be as unlike the QU-PAC, the SB does not have a screen or any physical buttons.