Maybe I am missing something basic to correctly save changes?
Ah! Thank you for posting that video. So, there is one key piece of information that you are missing. If you long press the HotSwitch button, then it will starts flashing to indicate that it has entered programming mode. So, to take the preset you were working on in your video as an example, you would long press the HotSwitch until it starts flashing. Then, you would change the HotSwitch mapping of Delay A parameter to 788 msec thereby overwriting the existing HotSwitch mapping with your new mapping. Then, you would press the HotSwitch again to make it stop flashing and to exit programming mode. And then, you should be able to go ahead and save your changes to the preset and have your new HotSwitch mapping take effect.