This isn't the official way to create a new dial with a Dependencies Button but here is how you can do it:

• Select the hand.
• Select the Morph Brush toll and do morph on the hand that is not noticable.
• You will automatically get a new Morph Dial with Dependencies button.
• The new Morph Dial will be called Custom Morph but you can change it to whatever you like.
• The new Dial can be dragged wherever you want in the dial list.

Now you can have fun with Start and Stop Teaching and create a custom finger grasp for that new dial.