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I guess it is here just to show the power behind the plugin. I agree with you, there is no reason to implement such a complicated way to toggle help. But enabling up/down/left/right to navigate through images is sufficient and intuitive (and awesome). And that's why this plugin is all about no ?

I think the idea was to draw a letter 'h' for help.

Or a question mark.

You, sir, draw a very strange question mark.

So maybe they could say to draw an 'h' starting from the top left.

The thought process behind this is the same as shortcuts. It provides advanced users with increased learnability and memorability design principles. After a user becomes accustomed to the application they can use these gestures much more quickly then finding their respective navigation.