Possibility to override SCM/Git credentials in Jenkins job settings

From a security point of view we would like to be able to use a read-only user for checking out code from Git. Since the release functionality of the Jenkins plugin uses the same credentials for pushing changes to Git as the ones used to check out, this is not currently possible.

I would therefore like to be able to override the default credentials in the plugin configuration of the Jenkins job and have them being used during the release process.

See the M2 Release plugin for reference: https://wiki.jenkins-ci.org/display/JENKINS/M2+Release+Plugin