Add a Preferences keyboard shortcut
There doesn't seem to be a shortcut to open the Preferences window, although most (but not all) applications have one. It doesn't seem either like a particular keyboard shortcut became used across all apps like F1, F10, Ctrl+?, Ctrl+Q or Ctrl+O, so no real de-facto one basically.
Builder uses Ctrl+, so maybe it could be adopted in the HIG so all apps could start using the same one?