Keyboard Shortcut Mode - to help learn shortcuts
Create a mode which would apply to all of Excel. In this mode, all ribbon functions that had Keyboard shortcut alternatives would no longer perform the function, but instead would display the keyboard shortcut. For example, on the Home tab lets say you wanted to Bold your text. When you clicked the B, it would just pop-up "Ctrl + B" in a text box. It would teach users the keyboard shortcuts very quickly and people would naturally start using the program faster.