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Eh, adding 1s to ready timers without any convoluted building system would be enough. It'd take a sting out of a lot of the instant moves with attentive stunners, while the direct TP manipulation should at least offset the RDM's presence so there's a net gain of damage and utility.
Adding 1 second or less to the timer makes the ability's utility moot on anything that builds stun resistance quickly or is flat out stun immune. The building mechanic for increase potency is a carrot to keep the RDM there, especially in cases in which a Mob's attack could potentially 1, shot the tank. I'd say bare minimum, 1.5 seconds, if not 2.