I've never had a problem with it. Explain?
If you do make a ten second looping "Door" event to spam bricks, you'll notice that the brick becomes partially visible, and wandable, for a very short time. It'll get annoying, but it is possible to wand these. If you're having a problem with people doing it, limit the amount of events they can make with the server prefs. (Read the Help File)
What actually stops people doing the same with Badspot's events? When I asked, Wedge said it would be "very annoying for someone to make all the bricks and give them different names" but it's still easily possible to make an AutoSpammer code macro.
You can't shoot through de-collisioned bricks, you can wand them normally.
You can't wand bricks that use the killbrick event because they are destroyed as if they were hit by a hammer.
You can wand bricks that use a looping fakekill event. Fake kill simulates minigame style brick destruction. The fraction of a second they re-appear before blowing up again is when you can hit them. Just wait for them while holding down the fire button, you'll hit them eventually. This is also true for disappearing bricks, except you hit them while they are fading in or out of existence.