Yeah, they can just write down the codes and exit the portal and re-enter it. It's not that big of a deal to not have the slash command to do it. I feel like there's some confusion going on where some people think passcodes themselves are going away. They aren't. It's just this GM command. If you have bases you want to go to, just write down the code, memerize it or coalition with the group. Pretty simple and not time consuming.