I do not actually think Larian used any spawning in their game, everytime it was needed the creatures were placed on the far edge of the map (or below it) and then teleported in using, eg. a zone trigger. Check CYS_BlackCove or Cyseal. However, I do not know if this is possible... but if you can copy placed items/characters using triggers, then you can have the ones you want below the map stand idle and then be copied using triggers and afterwards teleported to the location above using zone triggers or kill triggers. Ie. Walk into a zone, monsters will spawn, kill them all, a boss spawns... or something.
Even if the game does not support 50 players it might still be possible. Warcraft 3 got around this by using "save" codes, which spawned the character. As such, it was never the same character from your previous game which you had - simply one that was completely identical as the "code" copied its stats, talents, looks, etc.
So that might be a way to create persistent worlds.
Edit: grammer
Last edited by n1x0r; 09/07/14 03:34 AM.