Can I expand my hotkey bank?

There is no way to expand your hotkey bank, but you are allowed 6 rows of 12 hotkeys (1-10, -, and +) by default. You can use the up and down arrows on the Action Bar to toggle through these hotkey banks. As a shortcut, you can also use SHIFT+1 through 6 to jump to the appropriate hotkey bank (ie: SHIFT+2 will jump to your second hotkey bank). Special class related skills may allow for additional hotkey banks when using specific skills/stances.