Surgery.. what to do

Dad got a 3rd opinion on surgery today.  First two surgeons said no.  Surgery is however an option with Dr. Silbergeld at UW (Seattle) but requires that Dad be awake, and that he name items on a powerpoint during the procedure.  Dad was at about 61% ability to name the objects in our EGG yesterday and the cutoff for the Dr. to schedule the procedure is 60%.  This is not an obvious - yes, you should proceed with surgery decision.  There is risk involved.  There are three spots where tumor is present in his brain and this was the only section that was deemed operable, but again is in the speech part of his brain.  It is possible to make it worse, or to get in there, find that dad can't communicate well enough, and have to shut the whole thing down without any tumor resected.  Does anyone have experience with surgery in this area of the brain or with Dr. Silbergeld?  Dr. Berger is booked through the end of October and I don't believe we can wait that long.  BTW we had stopped Celebrex, Aspirin and Fish Oil in anticipation of a possible surgery.