Creating Keys to zones?

[bodi]

Since /flag on zones crashes the zone server, I would like to know if there's a way I can use keys to unlock zones.

I am trying to key each specific group of expansion zones, so that you have to do a quest to get the key which opens kunark to you, then another quest IN kunark that will give you the key to enter velious zones, etc.

Any ideas or help would be great. I just want a way to flag the zone until they get X item, without crashing my zone server. Thanks!