There was once a mod out there that ported the original Rainbow Six campaign to Rogue Spear. It was a total conversion, but had the expanded features of Rogue Spear. I would really like to find these.
Previously available here:
http://www.moddb.com/mods/classic-r6-ca ... ear/addons
and here:
http://bigbluesoul.7host.com/index.asp?seccio=down