Use smarter scripting if you want to /who several channels and not have it do all the /who's at the same time, thats what timers are for.
I suppose a 'Queue WHO commmands' option in mirc flood settings could be useful, although unless you set the flood settings real tight it will still send several before it triggers flood control and goes into queue.
You could also create your own, send the first and add all the rest to a variable, watch for the raw 315 and have it check if there are more to be done (from the var), if so remove the next from the var and start like a 2 second timer that send the next who command.
