So I know one way shield doors do the trick for preventing a player from going through a certain area and still see through the barrier. That may be all that you want or need. But what if you want that "doorway" to be a timed event, something that can become a pathway? I do not yet know of a despawn option for the one way shield doors, so what you can do is put a two way shield door in front of a dominion shield door, then have a time explosion deactivate it. Best as I can tell, it will not respawn unless you give it a respawn time. Just set it to spawn at start: true and spawn time: never, and you'll have a easily manuverable pathway!
If using coordinates, make sure that the two doors are two or three points away from each other (24.5 and 24.8, for example) to ensure that it can only be destroyed by the timed event.
Who knows, you probably already thought of this, but I figured I'd take credit if you hadn't.
P.S. If you want, I have an example in one on my experiment map. I'll put it in my fileshare for a little while, until I see you guys do a spotlight on something like this or use it in your maps. The map is called Forge Experiments.
