I've either missed the entire point of this or I'm dreaming. I think I need someone to explain this to me!
If a Deaf person is receiving traditional applause (I mean clapping), then they can see the actions, and not hear them. If that Deaf person receives 'alternative' applause such as the 'jazz hands', then this can also be seen, but no one can hear it at all. Deaf people therefore are not missing out or being discriminated against in any shape or form from being surrounded by people clapping. Therefore, are we not now just substituting one visible act (from a Deaf person's point of view) for another? And in dark auditoriums, who will see the jazz hands? There is also a range of auditory difficulties, so some registered Deaf people will be able to hear a small amount of clapping, and also 'feel' it.
I do understand the issues with noise levels and / or tone / resonance with regard to autism, and note that there is a variety of responses above from 'don't be daft, it doesn't matter to me' to 'yes, it would be a relief for me'. I get that, both sides. There are things that I can't cope with in the public realm and I have strategies for those, just as others do above (I get not everyone has). However, is this proportionate? That's one of the biggest and most important points in anything surrounding disability rights.
Before I get flamed, I have both physical and mental-health based disabilities. I guess I just need a 'proportionate' explanation!