Limiting multicast group to just log consumers, not all spread nodes?

Ok so I have mod_log_spread setup. *Great* stuff btw. 

Anyway, I have it setup where there are 6 servers feeding logs to 2
boxes running spreadlogd.

Currently I have the spread daemon running on all 8 machines, with a
segment like this:

Spread_Segment 239.10.1.1:4803 {
  box1 1.2.3.4
  box2 1.2.3.5
  ...
}

And then each apache instance is setup with

SpreadDaemon 4803 0

This works great, *but* ... every box receives every multicast packet,
because they all join the multicast group. Its not the end of the
world.. as traffic going in to each of these boxes is not that great,
but it may hamper scalability, and probably puts undue burden on the
switches during heavy traffic times. Is there some way to set this up so
that only certain boxes actually join the multicast group? 

Maybe this is better suited for spread-users.. but I thought I'd ask
here first.

THANKS!

-- 
Clint Byrum <[email protected]>