[exim] Killing Exim queue runners nicely?

Hi all,

We are moving our Exim queues off an NFS mount (always a bad idea to
begin with I know!) onto the local file system. Now we have quite a
large queue (~10000 messages), and we always have a few queue runners
going. Is there a nice way to kill these queue runners before moving
the spool - or can we safely just 'kill' them the normal way (i.e.
'killall exim') with the normal signal?

Cheers,
Ray