I'd advise not using a macro that reports everyone AFK. It could be considered griefing and might lead to a ban - especially as you are abusing your 5 chars to do it 5 times. As such it might fall under the forum rules for discussing exploits as well

This sort of thing is easy to get away with once or twice, but if a bunch of boxers start doing it and Blizzard get a lot of complaints then it might get Blizzard to look into their position on multiboxing.

Just a word of caution.

'Do as you would be done by' is not 'do as you are done by'