Is there a way to copy/paste the keyframes when creating a extrapolation cycle?

Extrapolation cycle makes a loop but it doesnt show any keyframes so if I want to change a detail in a long animation is impossible because that new keyframe will destroy the cicle.
Basically I want Blender to do this: http://i.imgur.com/gvvOYHX.png
Instead of the blank cicle: http://i.imgur.com/cLvpCNv.png

If you want keyframes copy/paste the selected keyframes (Ctrl+C/Ctrl+V or buttons on header). Pasted at selected frame number



I know I can copy paste the keys but was wondering if there was a method of blender automatically doing that when creating a new cycle. Because I might have a lengthy animation so going to copy/paste everything on the graph or dopesheet can be time consuming, specially when the keys are all over the place