well, it isn't necessary to define a css rule for every ID.
the job of assigning an ID to a div is to uniquely identify the element on the page.
now, it can _also_ be used to apply style to the element, but just because an element is identified, does not necessarily mean a css rule needs to be created for it.
the css applied by security assist is for positioning the forms elements within the form.
what specifically are you to trying to change? chances are it can be done with the existing css that is place.
if you provide more information on what you are trying to accomplish, and a link to your page, I can probably help you, but i don't believe your disappointment is warranted.
