I need a plugin to set user role... I have try "User Role

I need a plugin to set user role...
I have try "User Role Editor" (http://wordpress.org/plugins/user-role-editor/) but I need to add accsess to the widget, and its not seems to have this option.
So, mainly, a user-role that can add,edit and deleate post/page and have possilility to work with widgets

Thanks
Pedro