Control reject delay per-request?

[Phil Mayers]

We have a radius virtual server that takes macauth requests. We know for 
sure it won't receive user traffic and/or dictionary attacks.

But it's in the same process as another, which might.

Can we set a control: item or similar to set the reject delay to some 
requests and not others? I'd rather not break it out into a separate 
process for this sole reason.

Version is 2.2.3