Dear Shruti,
I understand your frustation at not getting a straight answer.
Children and adults suffering from severe autisme are a very difficult group to treat. In these cases, as with other mentally challenged, we cannot expect to be able to change a lot. We often see very strange gait patterns in the mentally challenged patients.
I have not experience in changing gait in this group and I have not read any articles on this subject, so I am sorry I cannot be of help in this respect. My question is why do you want to change the gait? Do you have a specific treatment goal in mind?
Esther