No actually that is the way I'd go and have gone. I put together a little module called AllUsers which I draw the information from the dbo.Users table and display in a gridview. In this way you can draw whatever info you need from the DotNetNuke database for display and even for modification without touching any core modules. The table is read into an array so you can also perform any function you need to like sort, etc. before displaying in the gridview. Of course if you need added pieces of data you can save all of this with new data (age, birthday, etc)  in your own table and install with a 01.00.00.SqlDataProvider file. Here are the import, dim and page_load code from my module to give you somewhere to start:

Imports System.Collections.Generic
Imports DotNetNuke.Entities.Modules
Imports DotNetNuke.Entities.Modules.Actions
Imports KE.Modules.FamilyTree

Namespace KE.Modules.AllUsers
    Public MustInherit Class ViewAllUsers
        Inherits PortalModuleBase
        Implements IActionable
       
        Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load, Me.Load
            'Collection of Data
            Dim arrAllUsers As New ArrayList
            Try
                arrAllUsers = UserController.GetUsers(PortalId)
                grdAllUsers.DataSource = arrAllUsers
                grdAllUsers.DataBind()

            Catch exc As Exception 'Module failed to load
                ProcessModuleLoadException(Me, exc)
            End Try
        End Sub

 End Class

End Namespace

Good luck,

Mike