http://nicolas-prothais.com/



This script allow you to copy keys or group of keys in the graphEditor 
simply by draging them.
This script as to be used as a Maya shortcut in combination 
of "dragCopyKeyPressRelease" furnished with this link.
To use it, create a shortcut with this script with the option set to "press".
And create the same shortcut for the script "dragCopyKeyPressRelease" 
but this time with the option set to "release".