I've been searching hard. I found an old copy of Advanced Broadcaster. It's no longer updated and not compatible with the current version of WoW. Still looking for an addon that supports the initial stated features.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
AutoText looks like a great addon. Yet, [item] links are not allowed and it's not multi-lined. Single text lines only. Wonder if the author could add those features. Any other addons that you know about?