Disable Parts of Directory Submit Page

Hi again, It seems that the functionality of the Submit Listing page doesn't really work the way I imagined.

Is there a way to disable the following:

-The Featured Image button (In my theme, the featured image becomes the main image for the whole section)

-The Add Media button (I don't want people having access to our media library)

-The Excerpt box. It isn't working as it should and is outputting only an excerpt that cannot be clicked on to see the whole posting.

-The Reviews - My listings aren't the kind that someone would review.

-And, what about Categories. Is there a way to only allow the person who buys a listing to select one category? As it is now, they could click on and submit to every category. That's not good.

Thanks for your help!!