Unfortunately there is no way to control this from the designer. If you need to do it you should modify a bit the code generation templates. A possible solution could be to list the full name of the properties that should be generated as TrackedBindingList<T> in a file located close to the code generation templates and then read it from the templates and generate the proper type accordingly.
If you have a client side stand alone application usually it should not cause any performance issues to generate TrackedBindingList for each navigation property. You should pay more attention if the same model will be used server side, as there the performance is more crucial and.
I hope this helps. Should you have any additional questions do not hesitate to get back to us.
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