Shift no longer allows editing leading space for notes in edit mode

At some point recently - one of the first changes made in response to Tantacrul's video - we made dragging a note affect leading space. Since then, there has been some back and forth as to whether SHift should be required for that, or if it should enable the old behavior of adjusting the offset, and same for arrow keys it should adjust leading space. But in 3.3.4, we had found what I thought was an agreeable compromise where in edit mode, arrow key alone adjusted offset, or with Shift adjusted leading space. We've lost that now, both operations adjust offset. It's still possible to get either behavior on drag, depending on whether the note is in edit mode, and I guess it's OK as is, I don't have a ton of insight into that. But I do miss the ability the have both behaviors via keyboard.