PHP Nuke to Drupal

Currently running sites in PHP Nuke. Playing around with Drupal 6 beta and am impressed. Looks like a great option moving forward. However, after being hacked in Nuke awhile back, I've become very dependent on Nuke Sentinel for security. Being able to easily monitor access, block harvesters, and block entire country ranges has been invaluable to me. I've gone from a plethora of nonsense hits from other countries to practically none. Is there any equivalent functionality or module to Sentinel for Drupal? I saw some registration block module or something but I'm referring to banning complete access to the site from countries via an ip-to-country type table and other site-wide monitors.

Also, I like the capability of being able to deny access to PHP Nuke admin functions by restricting admin.php via .htaccess. At first glance it appears Drupal goes through index.php for everything?