It depends on what you eventually want to see - and how long you can control the property. If it's yours forever, then you might make your goals a little more aggressive than if it's just yours for a couple of years.
It would also depend upon the experience of the hunters. If you've got people hunting who have never shot a deer, or haven't shot a lot of deer, you may want to be fairly free with what people can shoot. If you all have shot a lot of deer, then more aggressive goals should work.
You are probably right letting each hunter decide for themself, no one likes to be told what to do or feel like someone is trying to tell them what to do. At the end of the first season, maybe get everyone together, compare experiences and bring up the idea of managing for larger deer.
The rule on does, if you're in an area like we are, is shoot as many as you can, it probably won't be enough.
“There are two spiritual dangers in not owning a farm. One is the danger of supposing that breakfast comes from the grocery, and the other that heat comes from the furnace.”