These are just minor differences, but I believe it would improve the usage of the editor itself.
Note that I'm referring to the external Editor for editing PBS data and such.
One of the key differences I've noticed in the few that were made to the Editor as Essentials progressed was the fact that the ability to scroll by using a bar of sorts on the right was removed.
For instance, scrolling through the list of items was much more easier in previous versions of the editor (in the image, the one to the left is from the latest release, and the one to the right is from January 2010). Same applies for lists of Trainers, maps, etc..
Now, I'm aware that this is probably something minor (and more likely than not, few people know how to edit it, if any), but I think it's very useful for developers with rather lengthy lists, especially if the item, map or trainer you need to edit is the middle of said lengthy list.
The question, therefore, is if whether or not it is possible to return to this kind of navigation (and better yet, if people prefer it, which I'm pretty sure everyone does for the sake of simplicity).
Because left/right are used for changing the Bag's pocket. The official games allow quick scrolling with the shoulder buttons, but there aren't any of those on a keyboard so we'd need to use a sensible alternative. The most logical choice are the Page Up/Page Down keys, because they say exactly what they do.