Hi David, thanks for you interest.
The section 508 (I think is a standard for designers) is for people visually imparied to be able to use a screen reader.
Almost all the images on the site need to have an alt property in the image tags of the html code.
You are aware that you can put an image as submit button in the module configuration of dynamic forms.
The buttons is dynamically genererated by code.
Then the question is how can insert that property in order to comply with the 508 standards.