Split caching by size

[Jason Spegal <jspegal@xxxxxxxxxxx>]

How do I configure squid to only cache small objects, say less than 4mb 
in memory cache, and only objects larger than 4mb to the disk? I want to 
optimize the cache based on object size. The reasoning is the small 
stuff will change often and be accessed the most while the larger items 
that tie up bandwidth will not change as often and I can cache more 
aggressively. Also this way I minimize disk io and lag. I am using squid 
3.0. While I can see this being done with the disk cache I am not 
certain the memory cache can be configured like this anymore as the 
options seem to be missing.

Thanks,
  Jason