1. A method in a computing system for modernizing an existing menu-based legacy application having a plurality of executable individual tasks, each individual task configured to be executed as corresponding code module on a host computing menu-based legacy application, comprising: providing, by the computing system, a first level of configuration tools to a user with sufficient privilege to administer and configure use of the legacy application, the legacy application reorganized to provide access to the plurality of executable individual tasks on a role by role basis instead of via access from the corresponding menu item of the menu or sub-menu of the existing menu-based legacy application, the first level of configuration tools allowing the user with sufficient privilege to further define task customization tools configured to be used for end user customization of at least some of the executable individual tasks of the existing menu-based legacy application on a role by role basis, wherein the tasks and task customization tools associated with a role are only accessible to users that have proper authorization to conduct the associated tasks; and using the computing system, displaying the task customization tools defined using the first level of configuration tools in a manner configured to enable an end user to customize one or more executable individual tasks of the existing menu-based legacy application on an individual task basis, the task customization tools enabling the end user to perform at least one of configuring parameter values, determining task extensions, and/or determining output format for an individual task of the existing menu-based legacy application executable as the corresponding code module on the host computing system.