Sometimes you may want to key all the bones in your rig. You can quickly do this by selecting a bone, pressing the Select All shortcut (Mac:
A), and then using the Key Rotation shortcut above (
R). Note that the Select All shortcut works for any currently selected object type (e.g. if you have an image selected, pressing Select All will select all images). If you have no objects selected, the shortcut will Select All objects.