I would say it's unnecessary, but we still need input from the community. The forum ticket system already get bogus tickets, unanswered tickets, and claims for people who look at other people funny. Seriously, I would say that it would only contribute to GM work hindrance since we'd need to swim through pages of spam and fake reports.
Besides you cannot have a big typing space nor a way to upload screenshots in-game, which is something we ask in almost every ticket.