If you want to modify standard Eclipse plug-ins, you can use Feature Patch Projects. A feature patch project can contain plug-ins which replace existing plug-ins. This would allow you to create an update site for this feature and users can use your version of the modified code.

Each feature can only be patched once.

A feature patch project can be created via File  New  Other…​  Plug-in Development  Feature Patch. In the dialog, select the feature you want to patch and add all modified plug-ins to the new project. Finally, export the project as a p2 update site to make it available for installation.

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