Can I make custom draggable action bar button?

[Ethly]

Currently I'm using macro with something like /run MyFunction() and putting it into my action bar. Is it possible to create a button which I can put into standard action bar without using macro slot (which will call my function). For example garrison (and some Draenor zones) have zone action button which appears in the center of the screen but could be dragged to action bar. I want something similar.