There is a method to make it one click. It is the method I always use, and we put it in based on earlier comments. Just right click and choose "Locked Operations", then choose Digin. You can then digin unit after unit. After performing all of the digins, you will need to turn Locked Ops off.
Otherwise, it follows the same steps. Click on hex, then click on unit, then click on operations, and finally click on destination hex (if it is a move op. Otherwise, game executes op without the 4th step).
Hope this help,
Ron