Does mongrel_cluster support the concept of min-procs and max-procs like lighttpd fcgi where under load additional procs will be created

Does mongrel_cluster support the concept of min-procs and max-procs
like lighttpd fcgi where under load additional procs will be created?

I always thought that was a nice feature, to be able to have a minimal
number of procs running for a site and then when the load increased
fire up additional ones (up to a maximum) and then over time kill
those off when load backs off.

This allows one to host many sites on a server each only taking up a
minimal amount of resources until they are needed. It allows the
number of procs serving to be directly tied to how much load is
actually being used rather than an arbitrary guess.

So thus my question does mongrel_cluster support anything like this,
if so how is it configured (I didn't see anything in online docs)? If
not, does anyone know if Zed is planning to add anything like this?

Thanks,

Jeff