I found out that there are 2 Jenkins Plugins which have nearly the same name.
( https://wiki.jenkins-ci.org/display/JENKINS/Release+Plugin &
https://wiki.jenkins-ci.org/display/JENKINS/M2+Release+Plugin )

And both of them are very useful! But I wanted to ask why they don't fit together?
Because I really like the feature of the "Release Plugin" to be able to define build steps before maven releases are triggered. But obviously these pre/past build actions won't be triggered if you use the "M2 Release Plugin" for executing the release.

Would be great if the two Plugins work together and kind of "know each other"!