I noted that the boning knife does do damage. I had previously missed that line and complained because of my (now known to be incorrect) belief that the knife was doing nothing. So I withdraw that request :-)
But in playing I would do things like enable BatManRE but then use the Script button to do the combat since the BatManRE options were fine with me. I noticed when toggling that the unable to parse message occurred more often the combat after I toggled. Not quite repeatable but often enough to start looking there. I also noticed that SmartStasis is not always doing what BatManRE suggests. I faced a monster that I expected to Attack with Weapon based upon previous encounters and using BatManRE. BatManRE was not enabled and the use item slot in the relay browser was populated with the boning knife. Character doesn't have dual funkslinging so can only manage one item. I pressed the Script button and SmartStasis unexpectedly used the boning knife.
I will dig into this more but I wonder whether a) enabling and disabling BatManRE leaves something set that changes SmartStasis's behaviour or b) the BatBrain sort is inconsistent in that if A and B have the same value there is guarantee that one will always sort first.