I could not understand. Could you be more specific about what you are requesting and which build-in graphs are you talking about?

When using the Maven2 job type, test results are automatically displayed in a graph. See e.g. http://ci.jenkins-ci.org/view/Plugins/job/plugins_jabber/
When I enable the TestNG plugin for such a job, the TestNG results are displayed in an additional graph below that.

I would like to replace the build-in graph with the TestNG one as it is superior to it.
Additional goody would be to also replace the TestResultAction attached to the build with one generated from the TestNG plugin, so other plugins evaluating the test results (e.g. ci-game) would also the TestNG ones.

Thanks for the updated information. I am not entirely sure that this can be done, but will look into it later.

Reducing priority.

kutzi,

way back, via email conversation you mentioned you'll check with olamy and others to see whats the best way of handling this. Did you or others have an idea to point me in the right direction before I start looking into this?

Junit and TestNG publishers attach separate ProjectActions to the job and currently I don't know if a clean way of replacing Junit's ProjectAction with the one from TestNG for Maven builds.

To be honest, I don't remember if I posted this question to the dev-list at all. And if I did, I think I didn't get any answer.
The answer would probably be a new @Extension point in Jenkins core.