I have external port 81 forwarded to my computer running BI to support remote access. I could use C4 as you describe to access cameras, but I am not willing to give up all the features in the BI app - it just works too well. So I guess the choice is between allowing any LAN user (safe or not) unauthenticated access to my BI streams, or reduce the level of security (tho still have some) for the entire internet on port forwarded 81. Unauthenticated LAN access sounds like the better choice but I honestly may just forego the cameras in C4 all together.