Reply To: SearchForm Attributes, Slider Integration, etc.

What you request is not related to this add-on in any way. It is to give a resource an additional attribute, like if it has wifi or not, to have a checkbox in the search form to filter for wifi resources as guest.

For what you search you can use the widget, like here on the right. It does EXACTLY what you describe. You could even just add a html text field to it for you coupon.
Or you use the search form, like here, which is nearly the same but shows only available resources.
Both submit their information to the form. If you want to do it yourself the names just must be the same as in the form.