/stick
It can be used to unfair advantage, imo, in combat, in that it has the capability of automatically placing your rogue, for instance behind the mob. The character would move with the mob, as well. But no combat functions are built into /stick. It's basically a powerful, more accurate /follow. It would prevent many a falling death, or run-past-through-a-mob situations that /follow creates due to latency.
edit: and yes, I understand how one things can potentially lead to another. It's your server, your rules, I was merely inquiring.