If anything, we should plug the security holes. Gameplay-wise I believe there is a need for simple "game win" condition, for example if a certain amount of money is reached, and a way to reset all the players after the "game win". If these are added it becomes a nice and light multiplayer game. I'm afraid my little skills in php might fail for these, at least on the security side of things.
At the moment, I'm not seeing too much general interest for ezrpg, to justify the time and energy spent enhancing the game engine right now. Don't get me wrong, I'd like to see it done, but unless we figure out a motivation to do it, let's not get too deep into it.
Are there any "web game jams" or ezrpg would fit into? Any needs for barebones educational php game engine? Is anybody looking for easy-to-mod engine? If there is something with a deadline, that would be fun!