Automate scripted expressions for shape keys

I just thought of an idea,

Why not set many already scripted expressions for shape keys to save time like the picture below in Fig. 1 ? You don't have to edit shape key expressions all by yourself for characters. First, (fig.2 on below) We put a “mask” or whatever kind of opinion you want on the character's face, then activate the button. Once you're done, you have a whole expression. Oh, and it already scripted the drivers too. it’s just like rigify. what do you think?

Fig 1

Fig 2