Improved documentation for Ajax modules install

One clarifying question: Is this module to "enable" a module (check the checkbox) or "install" the module (downloading it from drupal.org).

The idea of "Ajax installation of modules" is handled in Drupal 7 core or in http://drupal.org/project/plugin_manager but both of those required considerable discussion about how to do this safely. It's not clear from your project description that you considered the safety concerns.