Directories in friendly urls

I have a question about friendly urls and aliases.
I have a structure like this
-home
-projects
--project1
--project2
-about us
-contact

Now i have an alias on projects called "projects".
I have an alias on project called "project1".

But now when i goto http://mysite.com/projects/project1
it doesnt show anything. The page i want is located at http://mysite.com/project1

So how do i get the container "projects" as a prefix of "project1". The resource is a container.
Now to achieve my goal, i have to alias project1 as "projects/project1".
But this is weird, since when i have 100 projects and i decide to rename "projects" to "work", i have to modify 100 recources.

Greeting
Joep R.

You need to enable "Friendly Alias Paths" in your site configuration.

Thank you very much, i lost that option since its not in tab 2 of all the options about friendly urls, nut a solo options about friendly urls at page 3 for people who are interested.

Gr Joep