Incoming Email in Service Manager 9.0

There are some aspects to the email functionality in v 9.0 that are major improvements; however, there is one big GOTCHA! In our organization we have assignment rules configured to take action on the incoming email based on the customers organization. This strategy worked flawlessly until we tested the upgrade to v 9. It seems that the processing of incoming email only attempts to lookup and populate the customer user id and no other information. This makes it virtually impossible to take action on the incoming email calls through an automated means.

To make matters worse, there doesn't appear to be any Stored Procedure or API documentation as there was in Infra v 8.

Has anyone found any kind of workaround or modification for this type of issue? It seems support is still 'Researching' this issue.