If you want to see the parameters values in the log, you should go to Model Settings -> Backend Configuration -> Tracing and Logging and check the Log Level to All.
Here is an article that describes the Tracing and Logging window in the OpenAccess Visual Designer.
I hope that helps.
the Telerik team
Q3'12 SP1 of OpenAccess ORM packs Multi-Table Entities mapping support. Check it out.