I love the new feature of linking requests, but think it could be slightly better.
While in a ticket you can of course link tickets to the ticket thus making it the master ticket. But linking tickets to the 'master' ticket isn't as easy. My idea is this.... perhaps have a menu item to 'link ticket to master' and this will bring up all master tickets that have tickets linked to it so it is a quick step to link tickets.
Another idea to build upon this would be perhaps to have the option to either have the master ticket moderated so that any tickets that are linked have to be approved.