[HELP]About Mobs

1. anyone know how to make all the mobs aggresive?
it will chase nearby player, without exception.

2. and how to control mobs re-spawn time?

thanks for helping. :D

#1. use mobeditor to edit that.. check the box when it nearby (i do forgot the whole sentence there)
#2 use leveleditor to control there's a respawn time

for #1, so i must edit 1 by 1 for every mob? is it crow.mnsf?

any kind-hearted people here that can help me?