Yes. This is a JMS no-no -- big time.
In a nutshell, JMS allowed some unproduced Crusade scripts up on bookface.com only with the assurance that these scripts could not be downloaded in any way.
Of course, they were. Also bookface.com, like so many other internet outfits, is now gone.
The material remains the property of JMS. He has never offered them for sale since Crusade died. By people trading them among themselves, any ability of JMS to sell these scripts is lost.
So, in an attempt not to bite the hand that feeds us, we do not swap these Crusade scripts.
Personally, I'd love to read them, too. But, such is life.
There are other B5-related works that are available: novels; short stories; comic books; etc.
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"What's up, Drakh?"
Michael Garibaldi