Just FYI.
Defining `doAutoCompleteProjectName` helps inputting a project name with auto-completion.
See https://github.com/jenkinsci/parameterized-trigger-plugin/blob/master/src/main/java/hudson/plugins/parameterizedtrigger/BuildTriggerConfig.java#L603 as an example.
(I think auto-completion is preferred, but not a mandatory feature)