You know what is best for your boy... if no surgery isn't sitting right with you then you should definitely contact Dr F or Dr S or both! Monkey is a cutie pie but I look at his pic and can understand your concern...not only cosmetically but the trigon aspect even if it is mild does seem concerning to me- that coupled with his speech delay would make me uneasy as a mom.
My son Xander had surgery for lambdoid a year and a half ago... prior to surgery he had no language skills- he hadn't even babbled as of ten months of age. Several months post op he finally began to babble and his first words came slowly starting around 18 mos. He is currently in speech therapy and speaking more and better all the time but it has been a long road and we have a good deal still to overcome. Just wanted to say that Monkey may really benefit from Speech therapy. I know the doctors don't believe that surgery corrects delay but in my mom opinion I just think there is something to say for he fact that Xander's speech is just about ten months behind where it should be... kwim?