Something like:
Code:
raw 367:*:{
  if ( $2 == [color:green]#channel[/color] ) {
    kline $gettok($3,2,33) Banned on $ifmatch
  }
}

should work.

Type /mode [color:green]#channel b[/color] to start it.

You could also use the IBL if you're in the channel and have the ban list, loop through $ibl(#channel,n).