I dont really understand what you want to do, but it sounds like this,
Someone msgs you if there is BLAH BLAH BLAH written in the text, and you dont already have a msg window open to them, you want to reply with $+ in five seconds, While maintaining the window your in.
on *:OPEN:?:*blah blah blah*:{
.timer 1 5 msg $nick $!!+
window -n $nick
}
On my system the "window -n $nick" isnt needed as PM's dont come to the front, but im tired and cant remeber if thats a setting or not., so i added that in.