We would also really like to see this, many of the other mentioned use cases are relevant to us. But from a support point of view, one of the key issues we have is with incident and problem management.

I'm currently stuck with countless incidents open as I wont allow the related problem ticket to be closed until the team have attached a full RCA. It gets messy using follow up tickets and is much easier to add the relevant information to the problem, unfortunately it can take some time to put this together and often the ticket is closed by the time this is done.

alternatively I have to have my agents manually closing the incidents down which defeats the object of the incident/problem linking in Zendesk. This is also made impossible with the current issues we face with bulk ticket updating due to the amount of fields we have available.