In the admin section there's a place to add fields to "customer forms" like registration.
However there isn't a way to add fields to contact forms in admin.
The form only has "full name" email address and comments.
For a business I can't imagine not requiring at least their company, phone number, perhaps a dropdown of what they're interested in.
Currently to just add a filled-in textbox for even first name we would have to edit several pages.
With that in mind, my feature request is adding the same customization features as is already built-in for registration.