If the weapon is scripted properly, this should not be a problem.
Start Blockland, disconnect from the RtB IRC, start a server with all of the ones you want enabled except the portal gun, get one that won't work, ready it, open the console, type trace(1); into it and hit enter, close the console, hit the altfire, open the console, type trace(0); in and hit enter, exit blockland and close the console.
You disconnect from the IRC and disable the portal gun because they both flood the console with lines of text when trace is enabled. At least, I think the portal gun does... any mod that uses the space tick thing.