Would you plan to implement the function which be able to select layer selection in layer palette with keyboard shortcut key (or with something else) as default in Glyphs App? We often use the layer control to make Smart Components. There are about 5 – 12 layers in the smart components to design Japanese Font. So it's needed that to select with not only mouse clicking, but also shortcut key or menu bar.
Sorry for answering late. There are two new commands in Edit menu > Other > Previous/Next Layer