[exim] "Accept with warning" in ACLs?

Still working on my warning header update...

I've been wondering, is there any nice and built-in way to say "add
warning and accept", or if you like "accept with warning", in an ACL
statement? I mean, can I tell the ACL to return "accept" directly
rather than continue processing ACL statements, if (and only if) a
warning action was taken?

Actually, I know I can, as I've been able to implement the behaviour I
want by using a combination of "set acl_..." and a "condition" testing
$acl_..., but is there a simpler and/or better way?

- Toralf