Yes, that is a good idea. I guess I was just too familiar with the program to think of it. It can be found by simply pressing escape and then going to settings and then controls and then keyboard.
Controls: Press escape and then go to settings, controls and then keyboard to customize your own. They are initially set to A = Z (keyboard), B = X (keyboard), L = A (keyboard) and R = S (keyboard). L and R are used to switch items without needing the subscreen and space (keyboard) loads the map which can be very handy in some places.
To see if you're in hero mode, just look at the top right of the screen. If it is a red square then you're in hero mode.