Allow or Deny from large numbers of hosts

All,

Is there a way to load a bunch of allow or deny hosts from a file or 
other data-store? I have several dozen CIDR expressions and they will 
need to change periodically, so it would be more convenient if I could 
load them from at least a file on the disk and clean-up my config a bit.

I suppose I could

     Include my-allows.conf
     Include my-denies.conf

And then use awk/sed/whatever to convert the lists of hosts into "Allow 
from [host]" and "Deny from [host]" but less tooling would be more 
convenient, of course.

-chris