Just checked out #2 (rhythm copy):
Very easy.

(1) --> Rhythm Mode
(2) --> Utility --> Copy
(3) Put your cursor on the source kit and dial up the kit from which you want to copy a rhythm instrument
(4) Put your cursor on the key letter to the right, e.g., C4 or whichever key the rhythm instrument you want to copy is assigned to in the source kit(you can just press that key)
(5) Do the same for the destination key where you want the instrument copied
(6) Execute.

Don't forget to save the kit in temp to your user location.