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Actually the main intended way of tweaking of the generated diagram code is the using of the @generated NOT tags for custom code. Additionally there is a way of using GMF-Runtime providers extension points for replacing the big chunks of the generated functionality, but experience shows that it is too high level and allows to replace/tweak only big chunks of the generated functionality. While GMFT recognizes @generated NOT as a sometimes inevitable escape for toolsmith, we should consider using the DI-based way of the customization targeting complete separation between the generated and customized code, similar to how it is done in XText.
Not ready for M3, moving to M4 now
Deferred to 4.0