Rate limiting in Apache

[dave-mlist]

I'm interested in doing rate-limiting with Apache.  Basically, I want
to give Apache a target bitrate to aim at.  When writing to one user,
it writes as close to <bitrate> as the user/network can suck it down.
When writing to two users (two connections), it writes to each
connection at as close to <bitrate>/2 as possible... and so on.

I've heard this can be controlled by mod_perl.  Can anyone point me to
some examples?

Thanks,
Dave