A small change that could help many people a lot: Make the current selection respond to the arrow keys (Up/Down) so we can transpose notes by semitiones instead of using the mouse (which is very fiddly).
Left/Right would also be nice if a grid can be selected. Although that’s not as important as transposing.
(Just a footnote – embedded JavaScript doesn’t run very nicely in Logic Pro, so many of these scripts will see Lua revisions in the future. It’s a rather long to-do list before I’ll actually be done with it, so apologies if that ends up being an obstacle for you)