Unfortunately not. Spamming the click is the only option. I didn't have time to work some more regarding the combat because of my daily job. After 8 hours of programming at work I found it hard to do it again at home for my game LOL.
You can find weapons spread around the island like an axe, a pistol and a katana so you won't have to spam so much as they deal far more damage. With the pistol you can also kill in one shot if you aim for the head.