Mine are:
More open areas that aren't enclosed in mountains. (EVERY LOCATION is encircled by some sort of mountain or a cliff)
Large open areas. (Think the Lower and Middle La Noscea size without the corridor feel)
Loot Tokens for Raids.
Moar S ranks. (Malboro that uses Stun + Bad Breath plz)
Weather specific mobs
Have like 50 other but I'm interested in others.