Yes, it'd had a lot of uses of this feature, it'd be nice too if we could scale an entire skeleton at a time, because in some situations is necessary rescale all the skeleton but not the bone layer, and is a tedious job... ( maybe this could be made with script).
...Plus, with this you could select several bones and Delete, Copy or Move his specifical keyframes in the Timeline (now you must do that one by one) and save a LOT of time, a lot of time, a lot of... ...TIME!