Yes! Absolutely. I think I even made a similar point in the earlier thread, but I was refering to the practice/drilling side of it instead of the planning side. Both are quite necessary in terms of preparation.
The only thing I'd like to add is to remember the KISS rule. Make your escape system as simple and straigtforward as possible. While still keeping it safe, of course. Jumping right out of the building would be simple, but it wouldn't get the desired result since safety wasn't considered. <img src="images/graemlins/wink.gif" alt="" />