Flood control can be done several ways.. basically you halt the alias if the command has been used too many times within too many seconds..

my code is basic and I am certain that others have much more effective code that handles per channel and is shorter.

Basic Example:

  ;allows 3 commands per every 2 seconds, change numbers as you wish
  on *:TEXT:Lol:#:{

  ;increments (adds +1) a flood variable that resets after 2 seconds
  inc -u2 %lol.flood

  ;if the flood variable has not incremented 3 or more 
  if (%lol.flood <= 3) {
      msg # $nick We are all laughing at you! not with you! I mean.. With you.. -AhemAhem-
   } 
}