Was using this mod to set up groups of dummy players as npcs for a little project and noticed it's a bit hard to get all the dummy players to certain positions or make them all do the same thing, would it be possible to add an argument to the /player command that does the command on every fake player rather than needing to do one at a time, such as /player [everyone] look?

Not sure how useful would that be most of the time, but you can always do something like that in Scarpet (by getting each online bot with something like filter(players('all'),_~'player_type'=='fake');, then looping your command with that.

Like:

fakes = filter(players('all'),_~'player_type'=='fake');
for(fakes,
  run('player '+_~'name'+' look');
);

Or if you need it to work like if you did execute it, just put execute as [your name] run in there.

Maybe even convert it into a function and save it into a Scarpet app:

allPlayers(command) ->
(
  fakes = filter(players('all'),_~'player_type'=='fake');
  for(fakes,
    run('execute as '+player()~'name'+' run '+replace(command,'%s',_~'name'));
  );
)

Then run with /script run allPlayers('player %s look') if you have it in the global command scope
or if it's saved in an app something like /script in [app name] run allPlayers('player %s look').
(basically run the function and %s will be replaced with the names of the fakes).

You can read the Scarpet docs if you want a custom command for this, you could do something like /allfakes [command] with the new command system, but I'm still not familiar with it.

Note: Those scripts were designed here in the browser, I didn't test them.