Yojimbo has a very nifty feature where you can link to a Yojimbo item from any other text doc in any other app (called copy link). Anything like this doable in Scriv, perhaps by using some third party software?
I cannot answer for third-party applications (though it would seem doubtful), but there is no built-in way to do this with Scrivener. There are a number of database style applications that support features like this, and it is quite nice for cases like that. I’m going to take a guess and say it was never included in Scrivener because a project is more of a sum, rather than a collection of small parts—at least for most people. Some do use it as a bit of a database, or to house multiple small projects. You might consider creating a page of Scrivener links at the top of the Binder; a quick navigation list if you will. I’m not sure how useful that would be, since Scrivener’s navigation options make getting around in a project exceptionally easy already.