So the core_issues repo is where you can get other folks to see your issue and pipe up with a "me too". The most effective way to get something fixed, though, is to have it through the support portal.
The "me too" need on the support portal is handled by the support team where individual customer requests for the same need get grouped together so that an issue can have its priority raised since it is no longer an isolated issue, as you mentioned.
I'm sorry your case is still On development. Have you been able to get an update from the team on progress there?