Umm I think it isn't possible.. Maybe use PHP to zip the target folder and move it to the worlds directory then unzip it then load it
hm... random maps are difficult i think... dont know how to change the current loaded map... dont think its possible...
When i have one arena so random maps works well but problem is when i have two arenas a would have same map only another folder
this i dont know as well xD i get only errors for some month if i change it not correctly so not by both...