Using something as intended =/= abuse.
There aren't any problems with what you listed OP, as all of them were the part of the intended result of x-realm in the first place.
You can't "steal" mining or herb nodes btw. Unless you manage to hack the game or exploit bugs that DC somebody while they're farming, it's first come first serve as always. There's nothing else to it.
Rogue saps you, Warrior stuns you, Warlock/Priest fear you away from something you're trying to pick-up, then they take it, is working as intended. All they're doing is playing the game.