This feature is very functional and very useful. So I think it might need to have an ability to copy all keyframes from this group to another group without manually copying per keyframe or selecting one by one (for many keyframes in one group), as like this:
Copying all keyframes from leftLeg to rightLeg and more
Detailed description of your suggestion
This feature is very functional and very useful. So I think it might need to have an ability to copy all keyframes from this group to another group without manually copying per keyframe or selecting one by one (for many keyframes in one group), as like this: