Well I tried to make so that the autonomy for the flirt interaction would only be enabled for flirty Sims, what I discovered is that tweaking the emotional score without tweaking the base score results in the autonomy enabled for all the emotional states but, if I backlist the interaction for the happy state (putting the score on a very high negative number as maxis does) Sims don't autonomous flirt when happy, but also refuse every attempt to flirt with them. I don't think the call off can fail, but I don't know what will happen if I backlist the interaction for the happy state and then try to call off the wedding with an happy sim. Not blacklisting the interaction can cause a mayhem but I'll see what happens.