Project Wonderland has a nice module warehouse that contains some modules that extend the functionality of the Wonderland environments.  I installed a couple and tested them out.  They seem to work fairly well without crashing Wonderland.

The city block module creates a repeating model of a city block so that a new city block is generated each time you reach the end of the city block model.   

The other module is a non player character module that allows you to add NPC that are controlled by a heads up display.  I've not looked at the modules code or even Wonderlands code for that matter, but usefull the NPC will need to support scripted behaviour.  His a  short video showing these modules in action. 

I apologize for the music, but I don't like voice overs or completely silent videos. I had to use something that was free, but also inoffensive .