Please allow users to edit the note value in the drum editor. This is important if you are using a drum library and are constantly messing with the midi mapping, but like the drum editor preset (the names, colors, etc). This will also make drum editor presets more modular since you could simply load a preset and start re-assigning note values to fit whatever instrument you are using.
This will cause an issue where a note will be already assigned, but this can be easily fixed with a popup dialog.
Here is the value I am talking about: