As the title says, i think picking up a turret should allow placing it somewhere else instantly. If it dies or explodes, i think the cooldown should start up.
Also, we should get a ton of engis in one server and play Tower Defense. Get people to pull enemies in a path. Or ANet could make this happen :P
Instant, no, but drastically reduced cooldown, yeah.
Definitely not instant for Healing Turret since it also has an instant heal on use, so dropping and picking it up would let you use your heal again immediately.
Also they already made a tower defense mode, it was Toypocalypse.
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