No, its not, because you can only do this WITH TEAMWORK! And its very different from holding down a button to spawnkill, its a very bad example to use. "I tried to come up with exciting examples of exploiting game mechanics that make PvP more exciting in games, buy none come to mind." Looks like you wont be finding the way to break this little tactic then. I too fail at finding interesting and original ways of exploiting game mechanics. We can cry together.