I don't think that adding tickets used to the scoreboard would be good, as it is somehow a useless information
Isn't 'consumed the minimal number of team tickets necessary' actually a good thing for a player to achieve?
Incidentally, I looked in the Wiki, searched forums, Googled, and checked in my game mod directories, and I couldn't find a document called "Release Notes", or indeed any document which described how tickets actually work. No doubt they're somewhere even more obvious than this.