i may have misunderstood some -but you could jsut do this now, that's what wiggi has shown?
and without any script stuff or changing anything. as long as you get people to use your own calculated gamestate (like wiggis gem client) you could have all the information you need.
every player has an address, and each player in time can have their address shown using name_history (in case someone else creates a toon with the same name)
maybe i'm not understanding completely though ..
Well, we can't have people playing by conflicting rules in the same game world... otherwise I'd make a new ability for my (hypothetical) client that makes the rest of you super easy to kill.
UNLESS we have different clients create transactions with unique headers!!! Then they could ignore conflicting ones completely so they don't even appear to each other on the map