I understand. And I also think that scripts should be tested thoroughly before being a part of the HG repository.
But there are many good scripts that maybe is not good enough for HG repository, but good enough to start with. Or get ideas on what could be done, or maybe just need small modifications to fit for that users needs.
And since Gene is not very active I think it is not very encouraging to make a pull request and it maybe get included within the next 6-12 months.
There should be a place where people could add just a link to their hgx file, maybe a link to the thread started on the forum and a small description about the script.
Then maybe more people use the script, test it, bugs get fixed, and then they could be a part of HG repository.