It's not a problem. It's like DMX. If Laser has in-channel assigned in LC than it must be controlled through that channel from some control-software outside LC, what do you think?
You can see LCPlay.exe file in LightConverse folder. This is a laser player software. One laser show you can find also.
We will add in short future a simpe laser controller to our software also, but currently you can control lasers from Pangolin only.
That player will output laser stream data to the Ethernet. LC will receive data from Ethernet and visualize. No data - no beam

You can run both software in one PC, in this case active Ethernet or Wi-Fi connection should be. Otherwise install Microsoft Loop-back adapter and virtual Ethernet will be always with you...