I see there are a few flags under /res info that are set for FALSE, and even as the owner, I cannot change it. monsters pvp What are they for and are they only changable by staff?
Monsters stops hostile mobs from spawning on your res, and PVP stops players from attacking each other. The reason they're there is because the PVP arena and Mob arena are considered "residences" thus needed a flag to have the PVP and mob spawning occur.
It is also used for a bunch of other events To answer your 2nd question, yes they are only changeable by I believe SS+