We are working on a new version of Authenticated plugin. Please let me know the features you would like in the comments or email it to me at angsuman[at]taragana[dot]com. We will provide several features and granularity in the functioning of this plugin. All the reported issues with the previous version will be solved. It will be a galaxy apart in terms of functionality over the Authenticated plugin. It will be targeted for WordPress 2.x blogs.