[Radiant] caching

[Todd McGrath]

> 
> The caching in radiant is most similar to rails action caching, not page
> caching. The radiant custom cache has caused a few problems
> for people trying to do session-based things with radiant code, but it
> significantly outperforms the rails action cache (or at
> least, it does in the mental branch).
> 


Can I set cache options, expire_time for instance, outside of editting the
response_cache.rb file directly?