From looking at the code you should be able to call static methods by Name.Method once you have added them to the predefined type list.
What you cannot do (even when you alter the Dynamic.cs code) is to push methods to the server because OpenAccess does not know what to do with it. You would need to mark the method with [SqlFunction] to achieve that.
My advice is not to alter the Dynamic.cs code to much and rather search for a non-dynamic approach.
the Telerik team
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