How do I give the screen little and/or big shake?

You can simulate a tremor or earthquake using map-scrolling plotscript commands. Here are a few example scripts that you can customize for your quaking needs.

script,quake while waiting,ticks=1,begin
  variable(i)
  for(i,0,ticks),do,begin
    pan camera(random(0,3),1,random(1,5))
    wait(1)
  end
end

script,quake while waiting for hero,who=me,begin
  while(hero is walking(who)),do,begin
    pan camera(random(0,3),1,random(1,5))
    wait(1)
  end
end

script,quake while waiting for NPC,who=0,begin
  while(NPC is walking(who)),do,begin
    pan camera(random(0,3),1,random(1,5))
    wait(1)
  end
end

Remember to use camera follows hero after using these scripts to refocus the camera on the leader.

See Also

Moogle1's Plotscripting Tutorials