CURRENT METHOD: double-click MOUSE to SELECT TILE TITLE, then KEYBOARD to EDIT TILE TITLE.
MENU: there is no menu command to edit LAYER/GROUP TITLE.
SHORTCUT: there is no shortcut to edit LAYER/GROUP TITLE.
It would be real nice to have keyboard shortcut and keyboard-only Layers Pane tile title editing for both Group and Layer tiles.
This would avoid current tedious switching back-and-forth between mouse and keyboard.
First, create MENU COMMAND to edit GROUP titles and LAYER titles in the Layers Pane.
Second, create KEYBOARD-ONLY method to scroll and edit GROUP and LAYER tiles in the Layers Pane.
Third, provide KEYBOARD SHORTCUT to edit layer selected by keyboard or mouse.
This is a VERY MAJOR UPDATE, and no denying that.
It will allow critical improvement for professional Pixelmator workflow.