Have you thought that maybe he doesn't wish to use the F3 and F4 key?
on *:TEXT:*:#: {
if ($1 == brb) {
$iif(!$away,away Ok bye,msg $chan Ok bye)
timer1 1 15 msg $chan Ok he's really gone lets all talk about this person
}
if ($1 == back) {
$iif($away,away)
msg $chan SHHH everyone be quiet he's back
timer1 1 15 msg $chan Ok I confess we were talking about you
}
}
Silly script, really. Sorta pointless at best.