The points system in Question2Answer allows for awarding points for accepting an answer to the user accepting the answer, which serves as an incentive to actually mark an answer as "best answer." However, the software awards the points regardless of whether the answer is from the person asking the question or someone else, and doesn't provide an option to change that behavior. This might tempt some people to increase their points by posting a lot of (trivial) questions and accepting their own (trivial) answers.
This plugin changes the default behavior so that points are only awarded to the user accepting an answer if that answer wasn't posted by themselves.
To activate it, copy the plugin directory to the plugins directory of your Question2Answer site (or clone this repository there), then log in as the site admin and enable the plugin under Admin → Plugins.