You just need to add a sign to your door that says: Expected time to replies: Via tickets: ASAP Via stickers on door: two weeks Via stickers on door AND three six-packs: ASAP.
I suspect some of our requirements will be: "avoids doing the things that annoy me as a end-user" I hate those $@*$&#@##~!!! ticket systems that send me email saying: "Nobody has actually looked at your ticket yet, but our 1980s technology auto-reply email is working just fine." I'd be ok with: "It's been 24 hours and person responsible hasn't looked at your ticket. so your ticket has been forwarded to the boss of the person responsible for filling your ticket."Seriously, a ticket system that allows the user to work through email is perhaps a requirement for us.
When I am a user, I don't like the extra steps of going to a website, (what was that URL again?) typing into a webform and waiting. I also live out of my email box. A ticket I've emailed, is findable for future reference.