Vista - Can I turn of CRL checking for Signed Email in Windows Live Mail

Short version of a long story.

The DoD (Department of Defense) has so many expired Certificates in their CA
Hierarchy that they use OCSP (online certificate revokation protocal) instead
of CRL lists for the intermediate CA(s).

This works fine on DoD issues hardware, which includes an OCSP Client that
overrides LSA.dll.

But I use a off the shelf computer.

Whenever I receieve an email from a DoD sender, Windows Live Desktop sort of
Freezes, while the CRL list is requests of the Intermedia CA. The CRL List,
of course, is like 50 MB...so I have to wait for a time out and to have
windows tell me. Sorry can't validate your Certificate.

I can turn off CRL checking in IIS via a modification to the metabase:

adsutil set w3svc/CertCheckMode 1

I checked Windows Live Registry have for a similar switch, to no avail. Can
this be done via the App? Can I hotwire an upstream .dll, to turn off CRL
check? Or am I essentailly hosed?

Thanks:
Dylan