Im with Zie on this one. This kind of raiding sounds like something that would be a little unfair to have in-game. But what if instead of having obsidian not able to be placed inside of the nether, you just add a plugin that makes it so that nether portals placed in the nether cannot redirect...
This sounds like a really cool idea but I think that the problem is cops being dirty and flat out not following the rules. I think something better would be to have a world border where cops cannot jail and frisk outside of the spawn or any other permitted areas.
-Epicgy
I used to play on this server many years ago and when I did there was this brewery plugin where you could make and drink alcoholic drinks that would make you drunk and even influence your chat speak. I really miss that plugin and I think it would be really cool to have it back. For selling you...