The ws Manage Users mod is for phpnuke and will better maintain your users. The mod allows you to browse/search all users on your website. You can set the fields that you would like shown such as "ip, registered date" and so on from the configuration.
This mod also gives you the option to see "Dead Users" based on your own criterias including amount of days since last visit.
There are 0 database script to install, settings are stored in a xml file.