At first I thought of adding instructions for the R and L button too but then I scrapped the idea. There wouldn't be much space to squeeze the instructions for the R button. (It makes pop up this window so it wouldn't be really needed)
The L button is practically "empty", that scrolling feature is needless, IMO.
Of course I would change that if I can make another good feature for the L button which would get an instant instruction in that message box. The same goes with the X button.
And thanks for the nice comment.
Edit: Forgot to say that this code uses the "Yoshi thanks message" by default. Also fixed a little bug where I forgot to change the Controller Data Byte adress to the one with "(one frame)" in it's name.