I like to shoot. But there are enough shooter games out there.
what could make Rust more intense would be a Medieval setting instead.
The same controls as the Elders Scroll games.
The amount of weapons would dwarf what we have now. And the game
would require more cooperation than it currently does.
This way, you could also easier implement skills and levels if you wanted to. Mods could handle that part.
A Medieval setting would also make it easier to add monsters.
I see less limitations with a Medieval setting than what Rust is today.