Shouldn't full support include Decay? A debuff is support, theoretically can be considered a buff if you want to get technical. This is assuming it does indeed stack with Amplify Pain.
Also if you take 2 out of Force Field and put 2 in Suppression you can mitigate some cc when the group needs the extra time. This is also a support factor.
Support isn't just heal buff heal buff.
616 is definitely the only way to start building your engineer.
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