anyway i think i might found a way to make a none copyable senario. I have never tested this but it might work.
1st place a minion unit for player0(gaia).
then add two triggers ASAP before the minion dies.
Trigger1 active
run imediately
condition: always
effect:modify protounit/minion/lifespan=9999999
Trigger2 active
run imediately
condition: player unit count/player0/minion=0
effect: set player defeated=every player
2nd shrink the minion untill it cannot be seen and name the 2 triggers somethin not very obvious.(only work if the minion has not died yet)quickly save the senario.
If anyone went to your senario and the minion dies before he saves the sen will end imediately when he tries to play it and he can no longer play that sen without finding the 2 triggers above or get another1.
if you remeber where you hide your triggers and you want to edit your senario just delete them and create a new set of trigger when your done.
this work for mercenaries too
Hope this helps