Alexander Hagberg has a few good youtubes of Sanwa radios.

You can set presets for race modes that you can select at the touch of the button to change the feel to accommodate, say a peaky battery at the beginning of the race. Buttons can be assigned for specific changes and increments - expo, trim, trigger curves etc, and sets of changes through mode selections.

I've changed a lot in settings but haven't got into presets. Not a reason I haven't. Before a race I might set something through settings when I could do it easier and quicker through a preset. Just haven't got into it.