Dear Mr. Christian
I have installed rhc and executed a few of its commands in order to see if ithe application is running properly. As far as I can tell, I have not encountered any errors while using the package. Considering that ruby-commander is used to help parser command line options for rhc and I have used quite a few commands of the package with no problem, I believe that the package does not break for ruby-commander bigger than version 4.3.0.
Furthermore, while looking at the repository Gemfile, there is a comment on line 25 that states that some gem versions were locked because they did not gave support for ruby 1.8 anymore. And one of this gems is exactly the commander gem.
https://github.com/openshift/rhc/blob/master/Gemfile#L25
If you think that I should investigate more or that my conclusions are not right, please let me know and will look further into the package.
Best Regards,
Lucas Moura