I know you've mentioned this elsewhere, but I was a bit confused by the tickets. I get what they are, but who is the intended user?
One feature I'd like to see is custom statuses. I personally am a big fan of "In progress -> Pending deploy -> Verify -> Done" instead of just "Done". It makes it really clear what just went out with every deploy, and allows the person who originally filed the issue to be the final arbiter on whether or not it was actually solved.
Another cool things would be integrations! If you have a ticketing system, it would be great if that tied into the tools that the customer support teams use. I use intercom myself, and it'd be handy if I could create a ticket out of an intercom request and remember to follow up with that user after the fix is deployed.