Lets make it black and white
Questions:
1. Open world NMs only? Instanced and item pop NMs only? Both?
2. Timed Spawns? None (Item and instanced pops only), short (5 minutes from ToD)? long (1 hour from ToD)? super long (24-72 hour spawn)? conditional (i.e. weather conditions)? mixture of all of these?
3. Rewards? Uber open world NM rewards? decent open world NM rewards? useless trophy rewards? Based on spawn conditions?
4. Open world Spawn area? One set spot? Random over several spots? random over an entire zone? Roaming?
5. Bonus question: Should people outside the claiming party be able to attack open world NMs?