I would use 100% use e-notes ICly in real time instead of repeatedly tabbing over to Google Docs if "append" were a thing.
"append to [1st] letter Abcd edgrgr fdgfdgdg"
"append to [notename] on [shi] dfjslfjlsdfksdf sdf sdlkf sd"
So this literally can be added on-the-fly, without having to step into the editor. Write as you walk! The more convenient we make those tools, the more use they will have.
Which basically just finds that bit of text in the item. And then replaces it. I don't think something this explicit as far as find and replace would be hard to do. Though it really depends on how the object is stored, and if the data types are mutable in LambdaMOO.
I'd propose something like that.
And an append verb would also similarly follow as you could end notes with a hidden line end character, and then when using the append, just call the find and replace on that hidden line end.