H.D.
As a mother of an Asperger's adult child I can sincerely sympathize! Believe me, you are LUCKY that your child was not born 20 years ago when they knew nothing about Asperger's. It took me fighting with schools and doctors for YEARS before he was finally diagnosed correctly in the 6th grade, by that time he was a sincerely frustrated child.
I frown on the answer your teacher gave, "how can she accomidate him", because she should already KNOW how to accomidate him! There is alot of information out there for teachers and it should be a part of their continuing education (I have a sister and friend who are both teachers, they have had to go through this). My answer to her? When your son starts to act out take him OUT of the situation so he can refocus, give him something creative to do, preferably something that applies to whatever the teacher is trying to show the class. Allow him to have a coosh ball, doodle pad or something else that he can use to concentrate...YES, concentrate. If he has something to focus on of his chosing he can also focus on the teacher. It sounds odd but it works. The rule becomes if you use your ball, pencil, doodle pad to distract OTHER children then it is temporarily removed, and I emphisize temporarily. The teacher is to sign his daily planner daily and send notes on his behavior if he is having issues and you are to do the same back for her. This enables the two of you to be on the same mental page and also keeps a continual record of his progress or issues that he is having...you will need this for his IEP.
On a personal note. Keep a journal. Observe him and other children his age. What seems "odd" to you? How does he interact, or not, with other children? Is he obsessive compulsive (a lot of them are)? Does he complain about stomach aches or excessive gas (gluten sensitivity has been linked to Asperger's)? Go Gluten free for a week and see if it helps is behavior....Get a book on it! There are tons out there now, see which one can guide you the best.
And remember this phrase, it has kept me from grinding my teeth and made me step back far enough to do the right thing for my son...."It is easy to love the lovable, harder to love the unlovable but they BOTH deserve LOVE!" =) Good luck!