Redmine

Hi , I have modified the default start page to "wiki" of project.But , is it possible to make a page which is not a project? as http://www.redmine.org/projects/redmine/wiki , when every one login redmine, he can view the wiki directly.
Now,below is my way :
root :to => 'wiki#show', :project_id =>'id' ,:as => 'home'
but , this is a project not page and I have to include all member to this project .thus , all just can view it.