If we enter a specific amount once, it erases the previously saved ones?
Discussion
Just discovered that I only partially understood the function, perhaps is better! You can set more values comma-separated and this let you pick them quickly. *But*, this way you cannot set a custom value without resetting the preset.
Instead if you preset a single value the overwrite is easy, just long press.
#[4] little bug: you should discard the zero value, it create a not functional button.