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I do love my poison trap, but in all honesty I don't use it in PvE unless I have to. It carries too much of a risk, since you stuck in the long animation, So unless I have to I don't use it.
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I have hover in my bots/traps MM which, as you mentioned before, keeps you from being rooted during the animation while laying a poison trap or acid mortar. This is incredibly helpful with poison trap. You still have the 2-3 sec delay before the trap is set, but you are mobile. I usually activate poison trap and then fly into the group of mobs. If you time it right you will have your trap right where you want it. You must be near the ground when you first activate poison trap, but you are not stuck while setting it. Don't pick up too much altitude while flying in or the trap will hover in the air and may not be tripped by the mobs.
This works with acid mortar too, but is not quite as useful since that is a ranged power. It is nice not to be rooted though.
This tactic does not work with trip mines however, since moving will interrupt the power (man, I wish trip mines took interrupt enhancements).
