I''ll look at it again - you should be able to see the suspended job on the farm before it unsuspends (you can force it to be longer by opening monitor and connecting, and then wait for the timeout when the dialog shows that something (RPM) is requesting queue control.)
The queue control thing is just the way they have designed Backburner. A manager like Deadline has no such issues (and doesn't submit frames to multiple slaves).
cheers,
grant