Thank you for reporting the issues. We are aware of them and we are already taking measures to fix them.
With regard to the associations in the visual designer there should not be any problem when working with the domain model as long as the generated code is fine. The inconvenience is that the collection is not shown on the entity diagram. The problem is being addressed and the next distribution of OpenAccess will not have such discrepancies.
The unnecessary using statements are taken into consideration and we will most probably remove them from our code generation strategy.
Do not hesitate to make more suggestions concerning the improvement of your experience with OpenAccess. Any proposals will be taken into account.
the Telerik team
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