Hi Frank.
I sent a pull request [1] which contains the plugin integrated into geany-plugins. Review and pull, if you wish.
I also created a repository [2] which contains geany-mini-script plugin at the state in which it was in SVN repo.
[1]: https://github.com/geany/geany-plugins/pull/13 [2]: https://github.com/earshinov/geany-mini-script
-- Best regards, Eugene.