I think this one it is not on the list, and i hope it wont create any polemic as before, i am just trying to help completing the list.
CHANNEL STRIP
Press Option ⌥ and make a 2 seconds click on the channel strip settings button, and you will see the menu with all channel strip (Inst, Audio, Output, Bus, Master), been able for example to insert a bus channel strip in an instrument channel without changing the instrument, or an audio channel strip on an instrument track or viceversa. Very handy
Cheers