Hi, I need wordpress to be able to have a login for individuals signed up on the site. The main trick is that when the client is logged in, I'll need the menu to be changed to show a few different items. Let me know what you can do via PM. Thanks.
If u assign limited role to ur users then they will not access to admin features and they will remain just writer or author, whatever role u assign them it depends.
This type of functionality is more suited for Joomla or Drupal. You might need to upgrade your WP to Wordpress MU depending on the rest of your requirements.
Using WPMU will be more save because u do not know who has bad aim among ur visiotrs so sharing all info with them is not good.