Hi musicman.chuen,
Thank you for your message.
Cubasis is developed by a fairly small team at Steinberg.
The app is maintained on a regular basis, and the next Cubasis update, v3.2 will be released on Monday, Dec 21, 2020 adding many new user-requested features and improvements:
Forthcoming Cubasis 3.2 release including new Waves IAPs
We try our best to fulfil the wishes from our users in a decent amount of time. Given the large number of user requests, and based on their individual complexity levels, some take more time than others.
Be assured, controller support (MIDI Learn) remains on our list for future updates with high priority, and we hope being able to add the feature request sometime soon.
Best wishes
& stay healthy,
Lars