I was not talking about the hack here but about a new hack regarding the possibility to edit all posts (instead of only the first post) with no time limit for specific forums. (For usergroups, yes this could be added by conditions for sure).
So, it's a little bit like your hack but acting differently. It's just that nobody seems to want to do one. But if it's not in your plans it's OK anyway. I thank you for this hack here.