Balancing multiple queues

[qma]

Does anyone have a script or rewritten sendmail wrapper that will
randomally pick between 3 or X queues to deliever mail to?
Basically want to run 3 qmail procs at a time, and when I have a script
send out mail, i want it to populate all three queues.  In hopes of making
throughput greater.  Have 512MB Ram on this dedicated machine, so may as
well use it.

Thanks for any assistance --
Adam