url_for not working when using aditional route parameters

I have a couple routes where I need to send additional parameters every time *some* routes in my app are called.

In order to stay DRY, it makes sense to set these parameters in the route, rather than passing them through for *every* url_for request.

Accordingly, I have defined a route as follows:

map.connect "sub_dir/my_friends/find",     :action=>"search",     :controller=>"friends",     :wrap_in_frame=>true,     :frame_height=>900

However, when I call url_for, it doesn't match the route, even when it is the *first* route in my routes.rb.

url_for( :action=>"search", :controller=>"friends" ) generates the default route of "/friends/search", and NOT the route I've specified above.

If I remove the additional parameters (wrap_in_frame and frame_height) from the route definition, than the url_for matches correctly.

Is it no longer possible to specify additional parameters when using routes and url_for? The Agile Web Development book states that it is possible to do this, but it doesn't seem to work.

Note that I don't want to use :defaults on the route, because I don't ever want the routes to show up in the url. Additionally, I don't want to use named routes, because I have a lot of url_for statements, and want to make sure that the additional parameters are set every time a certain path is called, regardless of whether a developer remembers to use the named route or not.

Am I doing something wrong, or is this functionality not supported?

Thanks in advance!