A MIDI file is a script. It just happens to be all numbers.

When you make changes to a script/text/list the most generic term for what you're doing is "editing."

You can invent just about any term you choose to use, but if you want others to understand, with reasonable likelihood that they'll know what you're talking about, the most generic term available that still conveys information is usually best.

When/IF you find others doing the same thing, you'll likely find a "trade jargon" that uses some other name for it; but the next group you find doing the same thing is pretty likely to call it something else.

John