They can spawn any single item they choose, I remember on one of the older Screenshot threads, a mod was spawning different partyhats in front of people and wearing them for fun. Jagex mods can also move people (you can find pics of people dancing in the old varrock fountain, and dancing with the white knights in the party room on the table), and do a ton of other things (Mat K said in the pic he can tele from 52 wild. Ya It comes with the downfall of No trading, No Fighting other players as far as I know (unless it was changed), and no fighting monsters i Believe. (I could be wrong, was Mat K Attacking the CE at the event? He was fighting both the revs and the chaos ele.