Rust Spawnrate, "killer modifier" (drown time, burn time etc)

Hi, is there something like that? maybe a variable in server config? or a plugin?

Thanks!

 

What I mean, is a "variable" controller, like the time you can be underwater without get drowned, the HP you loss with radiation, the spawn rate of animals (so we can have a higher rate = more animals)
That variables that are not in plugins yet (or at least I did not saw it)