Would be nice to creat large PVE zones on map that players can build on. But are still raidable. But if a player caused damage to structure like door, or uses an explosive on walls, they can now take damage from other players.  If another player sees this, now they can shoot raider. Now the player that shot the raider will be be on PVP mode as well. Bypassers will not be effected. 

I think its a great idea.