Today you configure credentials for Maven (global) settings file on Jenkins level. So all projects use the same credentials. Sometimes it would be good to be able to specify which credentials to use on project level though.
A special use case that could utilize this functionality would be JENKINS-27033, where the m2release-plugin would supply credentials on build time based on user input. This would then require a methods for this in the config-file-provider-plugin. I'm thinking this use case could also be applicable in workflows.