Server_IndestructibleBricks 
Interesting. Fixes the problems here, it appears.
If you want to solve this problem, yes. Stop whining otherwise and quit being a lazy kid. I did this with one of my spacebuilds and it didn't take very long at all, and honestly you didn't think whatever you're doing through enough if you didn't attempt to accomodate for this already.
This isn't something new, this has been around for years. Sitting on your ass and expecting everyone else to fix it rather than actually fixing the problem yourself is your own fault.
Brick physics are client-sided dumbass, you can't "lag people" by stuff that is only affecting you.
I'm pretty sure that if a server has an abusive, overprotective weapon such as the Shining Laser actively used in minigames, that it's not worth going to.
1. Good for you, try eventing the 30000 bricks in my city build when you can't see half of them.
2. I'm aware of that, but I worry that anyone who leaves those options too high would have some difficulties.
3. That was an exaggeration thrown in for lag example. Someone once built a huge tower out of 1x1 plates on a server and shot it repeatedly with a rocket launcher with similar results.
Anyways, how would this handle brick trust anyways? Bedroom freebuilds would be no more. Frankly, I think mapping is a lot easier to do.
EDITBEFOREPOST:
thats a good point. more reason why i support a terrain script for bricks.
It would be nice if terrains and interiors and maps could be kept.
i have a mod that makes all loaded bricks indestructible 
Good for you, Awdax posted something else just now.