I'm really not a timer person so I'd rather NOT have anything with 7-15 hours spawning time around unless it's that active time event stuff where everyone can participate and actually gain something from it.
Although the idea quoted in the first thread with the registration NPC is okay too I guess :x

Something I love though is all kinds of spawning conditions for monsters. Like a certain NM only spawning if you have used meat-type food, only during certain weather, etc.
I'm happy to see the dev team thinking about this