There's an app I read about, and tried yesterday, that makes taking a screenshot actually a tad easier than from the power button. It's an app called Tap, Tap. It has to be sideloaded, but it works great for me! Check out the article here.
My guess would be that you would have to use the power+volume button method for taking a screenshot of your homescreen. This is very annoying, and I even submitted feedback to them during the beta that the 2-button doesn't always work for people. Think of how hard that method is for someone with...