You should not set the isolation level to READ_UNCOMMITED as this is a setting for the concurrency control in the database, at the time of update or insert. Correct me if I am wrong but what you are trying to do is query both the database and the newly populated objects in a single query.
If that is the case I am afraid it is not possible, you can however use the scope.Transaction.Objects to retrieve the entities based on type and state. For example scope.Transaction.Objects<Customer>(ObjectState.New) will return a list of all the newly created(and added to the scope) entities of type Customer. Then you can append this list to the objects you have gathered from the database.
If this is not your case please contact us back. Hope this helps.
Have a great day,
the Telerik team
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