[Exim] retyr question

it appears that all retry rules are based on destination
addresses/domains. Is there any way to create transport-specific
retries? I have a couple of transports that have many domains routed to
them. I'd like them to have very low retry times while the standard
transports/routers have the normal retry time, w/o having to add a new
rule everytime I add a new domain. It doesn't look like this is possible
from the look I had at spec.txt, but I wanted to confirm.

Thanks
--John