Here are some ways of using copy + paste:
1: Create some mel buttons on your shelf
(highlight + drag the commands from the script panel onto your shelf.. or press CTRL+SHIFT+right mouse button on the menu command you wish to put on the shelf)
2: Tear off the EDIT>KEYS panel then you can move it around the screen and place it where you want.
3: Select keys using middle mouse on your timeline .. then use right mouse button on the timeline and select copy... then move timeline or select object to paste to and press right mouse button again on the timeline and select paste.
4:Select channel from channel box on righthand side... right mouse and copy.. right mouse paste..