I don't see it in Nick's UI example app, but it looks like a powerful utility and I can't get it to work. What would be an example of the configuration needed to do something simple such as change the font size of an event in a table if it matched an event type?
The discover app also uses a neat custom event renderer, actually for its navigation on the homepage.
There's a csv file in the app whose rows represent the views in the app, and I rendered the results in an EventsViewer on the app's homepage, using an event renderer and some custom behaviour in application.js to wire it all up.
I've thought about really taking that technique to the next level and doing away with the AppBar entirely -- just making dynamic navigation modules to render views and searches in categories.