We have a large and growing number of Jenkins instances . . . We don't have many Groovy script, but rather than carrying them around by hand, it would be nice to be able to put them in once place (network share for instance) and access them from any Jenkins.

Note this isn't exactly like your public repositories, because I don't want to have to import them . . . while certain scripts might be local to a given Jenkins, for the global Jenkins script . . . if they are changed in one Jenkins, I would like that update to appear for all Jenkins attached to the repository.