Indeed. However it could be an idea to add a dedicated way to communicate with the custom module to prevent confusion with osc messages that are meant to actually go out of open stage control (although in the end it would use the same bandwidth). I'll put a pin on that for further tinkering.
That's kind of the idea, I'm not very confortable with the idea that one can mess with its harddrive just by loading a random json session file, loading an extra custom module adds an extra step and a chance to realize what's actually going on since it ought to be human readable.