the first Beta of the Rhino Script Compiler is now available for download. It should generate RHP files compatible with Rhino5 (and hopefully beyond) from RhinoScript and RhinoPython files. Multi-file python scripts are not (yet) supported.
If you run the application by double-clicking it in Windows Explorer you can create new compiler projects, open existing projects, modify projects, save projects and compile projects. Compiler projects are pure XML files with the extension *.RHC. If you drag+drop an existing RHC file onto the application in Windows Explorer the project is compiled immediately.
This is just the first release but of course all suggestions and bug-reports are welcome.