I agree that’s a needed option. Guess we will have to wait until G+ opens an API for WordPress to connect to.
In the meantime you can set up a free account at http://www.hootsuite.com and add your G+ account. Then use their publisher feature to grab your feed and publish it on G+. Works fine for me, with the exception that posts without a default featured image will not have a thumbnail, and a gravatar only works through publisher.