Armature bone parent/child keyboard selection

You can easily select parent or child bones using the [] keys, or expand the selection with Shift [] . It would be beneficial for the behaviour to be adjusted to be able to select visible children, even if they are not the direct child of a selected bone.

This is for scenarios where you have a skeleton hierarchy like: MCH_01 -> FK_01 -> MCH_02 -> FK_02 -> MCH_03 -> FK_03, etc

The MCH bones would be hidden, but it would be useful to an animator to be able to use the [] and Shift [] keys to expand the selection from one FK bone to another.

As it currently functions, the [] keys have no effect if an FK bone is selected, but the MCH bones are all hidden.