The button highlight cannot wiggle. So you can have the text for the buttons wiggle, because that is rendered into the background. The highlight is static, so you might want the highlight to be a little box, arrow, or underline. Those can be made in Photoshop. If you don't know how to make a custom button (using the (=1) layer prefix, and (+) group prefix), then you will want to read the encore help documents.
Jon Geddes
Motion Graphics Designer
http://www.precomposed.com