As you have noticed the EntityDiagrams.cs file is regenerated whenever you introduce a change in your model and save it. This file is auto generated by a text template and there is no point in trying to change it if you will modify your domain model. However, changing the Entity Set name in the OpenAccess model explorer should update the contents of the generated file. This issue is fixed as you have noticed.
Regarding the OpenAccessDomainService, we have verified the error concerning the synchronization between the names generated in the context class and the domain service one. This issue will be fixed for the upcoming Q3 release. What you can now do to resolve the problem is change the entity set name in the text template. Locate the line that assigns a string of entity set names and edit these names.
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