@Narue
Some games like to pop out little tests now and then to check to see if the player is actually there.
Since for this game (I have not had a chance to play this beta yet) seem to be standing in place and just weighing down a button.
Perhaps:
A player is active with skills but static/immobile, spawn a monster that requires movement or you die. EX: Stacking DoT that is only removed by moving.
Other games like to prevent profession farming bots by spawning a type of monster that prevents farming until killed.
In WAKFU, when you farm, you get sucked into a fight where you have to “stomp” out the matching hard to see runes in order to “beat” the boss. Choose the wrong rune to stomp out and you get a heavy debuff to material farming. Defeating the special boss removes the debuff. (He shows up faster when the debuff is on).
Again, I haven’t seen it in game because I have yet to participate, but these are just ideas to hopefully help.