I'm hoping I searched throughly enough for this so as not to look stupid. But I'll gladly accept a "Look <a href='obvious answer'>here</a> dude" response as I cower in shame.
Is there any way (with 4.5 or 5.0) to use multiple LDAP servers for external authentication? Specifically, I've got several AD domain controllers that can service these requests and I lose the benefit of having redundancy without being able to either failover or load balance authentication requests from all services that use them (Zimbra being the operative one in this case).
If the answer's no, I'll go ahead and file a bug on it.