Ola,
I don't know how to change Assumed Answered. Do you see an option?
Thanks for the screenshots but I still don't see how ADDRESSSTRINGS gets set.
In any case, if you are going the SO16 route then you should specify the Recipient Type as something other than an email address (is there a User option? Or container element?).
Then as recipient you specify a different container element (not ADDRESSSTRINGS) with whatever user you want. Try it first with WF_INITIATOR.
regards
Rick