People would/should be able to destroy enemy conduits anyway, so I don't see it ruining any Capture games. I also think it should be one Conduit entrance and exit per team.
I think this really could stand as multiplayer mode of its own. Or each team has half of a Conduit portal, and they fight for having both halves in order to dominate on some objective. --- "A closet intellectual, he acts dumb to impress women." Daos (Doritos and Orange Soda) for Con2 currency name. I support this.