Forums Bug Reports $input or $? what's the matter?

Type /help $input, so it says:
bla bla bla...
Note: This identifier cannot be used in a script event. One way around this is to use a /timer to initiate an input request after the script ends.

So i put something like this:
on *:notice:*identify*:?:if ($nick == NickServ) { .timer 1 1 msg NickServ IDENTIFY $input(Insert your password for the nick $me,poqs,Password,Input Password) }

That returns:
* $input: can't use in an event
so what's the problem here? is it a bug? the same occurs with $? using or not timers.